Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e691ef01750c1fc…

MALICIOUS

PDF

35.4 KB Created: 2020-09-17 22:43:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a850076a2953631d43c7a4ab7ec8f552 SHA-1: 08cbd1837ce8d3614c1c71ee1b1ca5d8df5e58dc SHA-256: 7e691ef01750c1fcf995d11f61a0583978487f94364a3f6efed1789407444983
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though obfuscated, contains text related to 'test answers' and the malicious URL, suggesting a lure. The ML classifier also strongly indicated maliciousness. The file is likely part of a phishing campaign or a link farm designed to distribute malware.

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.me/wix?keyword=dau+acq+202+test+answers
    • http://files.legendsgolfclub.org/uploads/1/3/1/3/131383665/6087186.pdf
    • http://files.blythetierneydevermakeup.com/uploads/1/3/1/4/131406181/xagixur.pdf
    • http://zixapo.industryumc.org/uploads/1/3/1/4/131454207/5709541.pdf
    • http://files.laanimal.com/uploads/1/3/1/4/131407742/zuromuj_kozitiv.pdf
    • http://vinajomaf.wilsonhypnotherapy.com/uploads/1/3/1/4/131437308/rabiba-vejififawe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/8564/3420/files/sizukajefekezolopiwetuw.pdf
    • https://cdn.shopify.com/s/files/1/0427/4126/8647/files/51685009673.pdf
    • https://cdn.shopify.com/s/files/1/0431/0866/3456/files/13870250408.pdf
    • https://cdn.shopify.com/s/files/1/0429/7503/5541/files/nojuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/8137/5648/files/35892080962.pdf
    • https://cdn.shopify.com/s/files/1/0433/6300/8664/files/kijeta.pdf
    • https://bb925647-fd47-436c-a2c8-fbead4b283bb.filesusr.com/ugd/6f58fb_a25faa338a504f26a79d0df0acc486b2.pdf?index=true
    • https://d56e4447-a3eb-42dc-b6a4-ef6dda2d412c.filesusr.com/ugd/c722c2_d3ff32b265ef4ef489e68b257ca630b3.pdf?index=true
    • 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_off0000439a.bin
5cb67046362ae67119b5426e80b41f1a61d73a440841038e57be9df386a7ed27
pdf-font-stream PDF embedded font (sfnt) at offset 0x439A 5252 bytes
font_01_sfnt_off000055a3.bin
490bbf744cd0473b2f20b0a3e83e333f63ba8b725cbd7f874d5dccff9074de52
pdf-font-stream PDF embedded font (sfnt) at offset 0x55A3 14120 bytes