Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cdd9360227bdaff…

MALICIOUS

PDF

37.7 KB Created: 2020-09-01 14:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2218bedf09dbe57d3ebcd7f00e156cc9 SHA-1: 8725761870a6a6d19151dee3b928dfaf7b505d38 SHA-256: 6cdd9360227bdafff1f382c50dfc1ab59c85457db1f82ec5f6057a095c9a9f07
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to benign content, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wix?keyword=adverbs+of+frequency+multiple+choice+test+pdf', suggesting a lure to a malicious site disguised as educational material. The ML classifier strongly indicates maliciousness, and the PDF structure is indicative of a link farm or SEO manipulation tactic.

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.ru/wix?keyword=adverbs+of+frequency+multiple+choice+test+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/b27199_6705be1272cf4eda93ecd3a6ae88c33c.pdf
    • https://static.usrfiles.com/ugd/c836c3_2b6cbacfd99745f894a1acff3ca79880.pdf
    • https://static.usrfiles.com/ugd/d1c05f_c671652de23c4d118c48f75f1debc55d.pdf
    • https://static.usrfiles.com/ugd/70c1f8_b38e39ee826f4b518613b44653c35d94.pdf
    • https://cdn.shopify.com/s/files/1/0431/6128/8868/files/comfortably_numb_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0432/1673/2315/files/xixazipidiziwokolubabivo.pdf
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/lozafibe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/syed_ul_istighfar.pdf
    • https://cdn.shopify.com/s/files/1/0440/4966/2117/files/kixasuroj.pdf
    • https://cdn.shopify.com/s/files/1/0429/5481/7690/files/saxuxerevewovonat.pdf
    • https://cdn.shopify.com/s/files/1/0430/3349/3655/files/niniwubujuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9635/9580/files/6th_grade_science_worksheets_with_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/45490229960.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004616.bin
5c7b38800abeabe78151dbb19d9f0954467952ad128b8fd0eb7580d32d317c6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4616 5484 bytes
font_01_sfnt_off00005892.bin
0423ed6409ade13f0f6359743c1a06ba1b14e9255dcf0964521711eae1533f2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5892 10320 bytes
font_02_sfnt_off00007b9e.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B9E 4324 bytes

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