PDF malware analysis — malicious · a99f4fd619f5d85b

MALICIOUS

PDF

51.4 KB Created: 2020-10-28 11:52:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14

MD5: c15671d913b416a88fd4f889082fa384 SHA-1: 3cba4cc46934c91e7919c0c469f4640c20715a18 SHA-256: a99f4fd619f5d85b305b6c3307373ebb00c83a50aa3a2934cf1c1ce046737573

194 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, many of which point to redirector infrastructure like "https://ggtraff.ru/strik?keyword=nko+dcpo+answers". This suggests a link farm or phishing campaign designed to redirect users to malicious sites. The document body itself is heavily obfuscated but contains the same redirector URL, reinforcing the malicious intent. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK

PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://ggtraff.ru/strik?keyword=nko+dcpo+answers In PDF document text
- https://cdn-cms.f-static.net/uploads/4401714/normal_5f9846ad50630.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4372072/normal_5f8e21e54ce34.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4385026/normal_5f8ef238c8e87.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4375356/normal_5f8b89752ce92.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4392666/normal_5f9873d03f6de.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4418368/normal_5f98f7c030c1b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366000/normal_5f89671c26e68.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4426425/normal_5f98956422f72.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/petikamov/fawadariz.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b4253955-92cc-457f-bd23-597a06e7d899/lugowowenevulizezafiso.pdfIn PDF document text
- https://s3.amazonaws.com/punurum/pdf_file_format_software_free_download.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/2b5edc40-4d27-42f8-85c6-14390093af5e/63374631119.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0484/2435/3960/files/80043188708.pdfIn PDF document text
- https://s3.amazonaws.com/mijedusovineti/7312674827.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0266/9087/9667/files/60399304287.pdfIn PDF document text
- https://s3.amazonaws.com/xetasif/begopovotopifadus.pdfIn PDF document text
- https://s3.amazonaws.com/tibanepoxilibud/27920314620.pdfIn PDF document text
- https://s3.amazonaws.com/nokiva/fluke_multimeter_115.pdfIn PDF document text
- https://s3.amazonaws.com/zuxadol/6766244461.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d57fe1d9-cb70-4281-aa8a-a30e739ee9c9/debewixez.pdfIn PDF document text
- https://s3.amazonaws.com/bevekizadoxuj/tiluges.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d2428634-38a5-42c4-9e87-ac82afa0c00d/29308856207.pdfIn PDF document text
- https://s3.amazonaws.com/xanebavifamopez/15908563418.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0479/2775/4908/files/98181470939.pdfIn PDF document text
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://scripts.sil.org/OFLIn PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000671b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x671B	3124 bytes
SHA-256: `f9e085b2f8d57453f723444e4f99497d472844172038c4507968c4e502fec312`
`font_01_sfnt_off0000724f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x724F	5160 bytes
SHA-256: `3e00c5f71853bdddcf37650463183c9e3e8604d9fea0cc82adf804ff14244ecb`
`font_02_sfnt_off00008406.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8406	10148 bytes
SHA-256: `a47053d898b2049bb6afea7d84fcfeb67643cb9d873046b06c83e515876e8110`
`font_03_sfnt_off0000a705.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA705	17008 bytes
SHA-256: `a88d2ec89a846d0e03e3d8760677852f443ddd9d5b529bdeac72747d787ce4b8`

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