Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e3a700613abdd78…

MALICIOUS

PDF

38.9 KB Created: 2020-08-25 11:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36d8c75e002b51241f0a9552bafe9a05 SHA-1: cad143d7dc35dfa4e14b2fb99d04d24f5d18a446 SHA-256: 6e3a700613abdd784a58779750e549c09c081615ef9fee1ca6aea3088cfb1369
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a biology textbook, which redirects to a malicious URL (ttraff.cc). This URL is part of a link farm designed to attract search engine traffic and likely serves as a redirector to malicious content. The ML classifier also strongly indicated maliciousness.

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=biology+book+pdf+miller+and+levine
    • http://files.alanveale.com/uploads/1/3/0/8/130814252/vuxedek-jesutoniwelife-xidopunezix-voxojewutek.pdf
    • http://fojuge.mylma.org/uploads/1/3/0/8/130874359/vexamijawi_dazere_zalafebebuw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/ic_cd4011.pdf
    • https://cdn.shopify.com/s/files/1/0447/2481/3977/files/91684555385.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/kopisabefutusebi.pdf
    • https://cdn.shopify.com/s/files/1/0431/8763/4338/files/gotalukikajininirutedotok.pdf
    • https://cdn.shopify.com/s/files/1/0431/8206/3777/files/53027008918.pdf
    • https://cdn.shopify.com/s/files/1/0437/7106/8577/files/bioecological_theory.pdf
    • https://cdn.shopify.com/s/files/1/0429/8244/1113/files/5675875394.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/fafavera.pdf
    • https://cdn.shopify.com/s/files/1/0429/6035/5487/files/assertiveness_in_nursing.pdf
    • https://cdn.shopify.com/s/files/1/0431/5349/0071/files/wobufifazidimajuralabe.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a06.bin
364fddcf43971043409cda54d2610aeaed67e1ab76ec48c7d213a543f704f61e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A06 5600 bytes
font_01_sfnt_off00006d01.bin
df4ff55ca6a8dab0185415d9d218fc3e2a7a170495f8f64c0970628f2647dd38
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D01 9896 bytes