Malicious PDF — malware analysis report

Static analysis result for SHA-256 163671a627a14d20…

MALICIOUS

PDF

43.6 KB Created: 2020-08-03 21:00:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20d70c675189b79cbbc0583f394bc15e SHA-1: 577e09e7c180eeae16b31e0b0246a74e5be876a2 SHA-256: 163671a627a14d20dff1544794016b493274c004ceaf5bacffbf921bc9176c9c
162 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'account receivable process' and includes the malicious URL, suggesting a phishing lure. The ML classifier also strongly indicated maliciousness.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.com/pify?keyword=account+receivable+process+pdf
    • http://files.creatorshandministry.org/uploads/1/3/0/7/130739537/166c433f9e75ad.pdf
    • http://files.mahonebayscarecrowfestival.com/uploads/1/3/1/3/131382808/tojurijatiwuxuwimabe.pdf
    • http://tolax.madisoneastvolleyball.com/uploads/1/3/2/6/132695663/nasugakavajoniliraw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/1566/5826/files/pedorukejoxikeg.pdf
    • https://cdn.shopify.com/s/files/1/0428/7257/0012/files/59576669396.pdf
    • https://cdn.shopify.com/s/files/1/0429/5131/1513/files/dexobetikakuneve.pdf
    • https://cdn.shopify.com/s/files/1/0429/1005/6615/files/40558558742.pdf
    • https://cdn.shopify.com/s/files/1/0429/2725/9811/files/kakebo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2411/files/76359274268.pdf
    • https://cdn.shopify.com/s/files/1/0437/0504/1051/files/88588173407.pdf
    • https://cdn.shopify.com/s/files/1/0428/2135/3635/files/wewomiw.pdf
    • https://cdn.shopify.com/s/files/1/0441/0900/4952/files/d_d_3._5_complete_psionic.pdf
    • https://cdn.shopify.com/s/files/1/0432/1368/4891/files/67541925337.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_off00006d57.bin
76f992fdc801a9346a35b65eb93ac8fa3c838da289ca8622c458519e774b013d
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D57 5340 bytes
font_01_sfnt_off00007f91.bin
a56b50531eff7ac0d4d60f85f94c0fa48fce60775130a8418f4aeae5372ce0e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F91 10032 bytes