Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc143d42e6530ff…

MALICIOUS

PDF

44.7 KB Created: 2020-08-19 11:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a11b7df340fe53f322350b57cddf9e9 SHA-1: 42496cf3e194efafda42dfabaf143411b52fff2b SHA-256: 5fc143d42e6530ff92f454023cbeb9046e574531b90432d158f6b5923bbf94a1
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'KBC question answer'. The presence of numerous external PDF links, many hosted on Shopify, suggests an attempt to create a link farm for SEO manipulation or to distribute further malicious content. 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=kbc+question+answer+5+may
    • http://files.portabletoiletsmichigan.com/uploads/1/3/0/7/130775304/3ed70.pdf
    • http://rapeza.bnhlivestock.ca/uploads/1/3/0/7/130740221/wokixuvobevovexes.pdf
    • http://fipir.actorportrait.com/uploads/1/3/1/1/131164250/7385295.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/8451/3434/files/sudaxetavaxofowujedavuwu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6704/0163/files/sql_try_catch.pdf
    • https://cdn.shopify.com/s/files/1/0433/6769/4501/files/ninikomejudewonukeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9121/files/22601868301.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/melokujawexovuganikorav.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/31928738492.pdf
    • https://cdn.shopify.com/s/files/1/0429/7103/7855/files/kavakuwobavegani.pdf
    • https://cdn.shopify.com/s/files/1/0441/4291/9832/files/6729490812.pdf
    • https://cdn.shopify.com/s/files/1/0437/3390/9665/files/xoporovojazuzenowoweji.pdf
    • https://cdn.shopify.com/s/files/1/0429/0904/0803/files/inquisitorial_and_adversarial_system.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_off0000619d.bin
a8b668d89e1cac5e23e7ad761fdf20943611fbcfacd759149209148baa152207		 pdf-font-stream PDF embedded font (sfnt) at offset 0x619D 5348 bytes
font_01_sfnt_off000073d1.bin
89bc2511cfa862d9897c25ff876079447ee54ca852ba93e6053c12ff2f52ce77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D1 10652 bytes
font_02_sfnt_off0000983c.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x983C 4324 bytes

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