PDF malware analysis — malicious · bc9f13deb82ebcf4

MALICIOUS

PDF

42.4 KB Created: 2020-10-20 03:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10

MD5: a4f2eb5399c80345d42ad0d33bb1cf96 SHA-1: 1812b26919e6f464378438e1a434d7c395c0ef23 SHA-256: bc9f13deb82ebcf484494fe31ca422d0a62ae88b7c9bcee4e8fa257ba2141faa

194 Risk Score

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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://ttraff.cc/123?keyword=psiphon+pro+lite+handler+113+apk+download In PDF document text
- https://nudojafobedem.weebly.com/uploads/1/3/1/3/131379550/vopisovaz.pdfIn PDF document text
- https://gepobuxew.weebly.com/uploads/1/3/1/0/131070920/cc913e564d325.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369633/normal_5f88a70bbca56.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366399/normal_5f87760e0b538.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4365646/normal_5f8705e4ecd72.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4383146/normal_5f8dec732b679.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366351/normal_5f8a1abe0e1ef.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366351/normal_5f8e23b50a1e4.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/fdd56952-1e4b-4bb6-bfba-ad9bf321c0f9/52214561828.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/72e8e46e-9cb3-4b24-ac77-ec1364639597/dijaken.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/8e1b8703-38fe-4d89-901e-6684fef63bd6/kubutaxupemo.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0481/5083/9445/files/tukufupademevikowufugo.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0482/4763/6122/files/momoduboxekagudenemiduw.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0483/1546/5883/files/optic_gaming_book_free.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0502/1155/3473/files/bezudokise.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0433/7323/2291/files/what_is_curriculum_in_hindi.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0491/9135/4534/files/anatomia_cuerpo_calloso.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0492/2199/2599/files/56855579594.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0499/4374/0571/files/2034055227.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0488/5236/9595/files/julio_claudian_dynasty_descendants.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000531d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x531D	5420 bytes
SHA-256: `d39b56c42d24bd43e9d125b05cd3ceaace1ec4d53bfa34006d5294eaa2f45523`
`font_01_sfnt_off0000658a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x658A	9712 bytes
SHA-256: `e84dda629f73a90635bd4299c435b9677ffd58c440d1ecda4b9d1a2c94d07526`
`font_02_sfnt_off0000870d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x870D	16076 bytes
SHA-256: `7348a63ea9206f1dd9d85ac5b8e77a4d6d13d552d707fc8209e912c0db264539`

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