Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c9fbcb798480c3…

MALICIOUS

PDF

49.8 KB Created: 2020-08-01 09:30:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 35bfb7c6fea9c538268c0b346c0fc007 SHA-1: a2115393114394b55702ebba0624079f2783f2b0 SHA-256: 39c9fbcb798480c3de8638fc512a9f33269fc627010c788a2007c44eb4a597d9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated and contains a URL that appears to be part of a link farm or SEO manipulation scheme, likely intended to drive traffic to malicious sites or for other deceptive purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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/pify?keyword=tolower+string+c%252B%252B
    • http://files.williamessex.com/uploads/1/3/1/4/131413678/kififeki.pdf
    • http://files.demornewarrenddub.com/uploads/1/3/1/6/131637099/8a230.pdf
    • http://files.overhauls.info/uploads/1/3/1/1/131163955/fomadudetofumif_geporokomun_tesumi_linun.pdf
    • http://files.flyzephyr.com/uploads/1/3/1/3/131398591/tadupiletokeg.pdf
    • http://files.sarahkilchgaffney.com/uploads/1/3/2/6/132696104/kupufupovizabetizoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0657/files/wemodinixipadomofukiwotas.pdf
    • https://cdn.shopify.com/s/files/1/0431/6489/3345/files/98253338695.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/10450582124.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/ziwodukujaluladiludu.pdf
    • https://cdn.shopify.com/s/files/1/0439/1292/1256/files/66298440644.pdf
    • https://cdn.shopify.com/s/files/1/0436/4396/1494/files/tavevisirupisalej.pdf
    • https://cdn.shopify.com/s/files/1/0437/3771/0744/files/xarivozexerekawuxoxavubu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/35375345248.pdf
    • https://cdn.shopify.com/s/files/1/0436/6319/6310/files/judawituzifekurujolaxux.pdf
    • https://cdn.shopify.com/s/files/1/0432/8158/0200/files/8723451669.pdf
    • https://cdn.shopify.com/s/files/1/0430/1740/4573/files/kufavepizeduvuvus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lajuvifubukakevo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000648c.bin
9b73905e9975d6aef8747726334226ee9a7f67a16010b6ad8395d798d2a4ce71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x648C 4800 bytes
font_01_sfnt_off00007507.bin
6eb0b2d75724f9cd398f23199f18a0a7f0c3874c84872ac7ca4408d5bcfffae2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7507 15116 bytes
font_02_sfnt_off0000a460.bin
531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA460 16312 bytes

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