PDF malware analysis — malicious · cb5ef73123b2ec23

MALICIOUS

PDF

89.7 KB Created: 2020-10-24 17:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26

MD5: 67cb2a5df7adac160c68274d693fced4 SHA-1: 2d64412261d5ac570913b7d11329ac66827b38e0 SHA-256: cb5ef73123b2ec23e2b48c24131ea6b847ecadccb008aab9b164a2f3497431df

214 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many pointing to link farms and redirector infrastructure, indicating a likely SEO spam or phishing campaign. The embedded child PDF also contains suspicious findings, including malicious redirector links. While no scripts were directly executed, the structure suggests an attempt to drive traffic to malicious sites, potentially for further exploitation or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9645

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.
Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
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/wb?keyword=add%20three%20addends%20worksheet In PDF document text
- https://cdn-cms.f-static.net/uploads/4387808/normal_5f8df5b17d19c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4378605/normal_5f9382a88a88d.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4385413/normal_5f930822ac182.pdfIn PDF document text
- https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/mufozexoguvub.pdfIn PDF document text
- https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/8138098.pdfIn PDF document text
- https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/nazobupe.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4386591/normal_5f9431c829574.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366008/normal_5f87113980aca.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369762/normal_5f8ab172adf7b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4365626/normal_5f87049f87f85.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4388617/normal_5f8e2688997b5.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://s3.amazonaws.com/zirojopemup/30869723303.pdfIn PDF document text
- https://s3.amazonaws.com/tapexiw/56108221100.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0496/2431/8115/files/35956487334.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0431/3628/6877/files/nova_lista_iptv_apk.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0496/7107/8045/files/84209978381.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0432/6601/5395/files/garou_mark_of_the_wolves_apk_data.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0480/7481/7693/files/60684847883.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0480/7481/7693/files/98331066643.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00007a4f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7A4F	4768 bytes
SHA-256: `0ed5b99cde8c0dd7a02e574c08a3a52d735c4835a5da4ce5bcfac61a38b50129`
`font_02_sfnt_off00012694.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12694	10904 bytes
SHA-256: `8a6622a040e2bfac5977efb02336880de382330524b1604266979cae6e64a775`
`font_03_sfnt_off00014b29.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14B29	4324 bytes
SHA-256: `cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34`
`polyglot_child_pdf_off00009c22.pdf`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x9C22	51856 bytes
SHA-256: `c521f663eb34e0e3b365ae824093efe2d05057592b779fbc0264eb8131e1a0e2`

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