Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b1a1fd0e3ae942…

MALICIOUS

PDF

44.6 KB Created: 2020-07-21 15:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26958dfec2f9644ccbba87f8d000ef5e SHA-1: 882fe21df2890841ffd5e41d8e931a6ced4733a9 SHA-256: 88b1a1fd0e3ae9420d15f29e416a1607d3c823cff22bf7150e40073d95833d6c
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector infrastructure. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm suggests an attempt to distribute malicious content or phish users. While no scripts were directly extracted, the PDF structure and link farm indicate a likely attempt to exploit vulnerabilities or redirect users to malicious sites.

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=functional+training+handbook+craig+liebenson+pdf
    • http://files.retrieversystemsco.com/uploads/1/3/0/8/130813054/6180382.pdf
    • http://files.kwtintl.com/uploads/1/3/1/3/131379899/xizipuviwagozuvu.pdf
    • http://files.roland-realty.com/uploads/1/3/0/8/130874474/f72a49e479baf.pdf
    • http://files.johnpurcellauthor.com/uploads/1/3/2/8/132814337/kimutexaku-nufajaxuxabibo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/5387/5357/files/xuzirusukebopub.pdf
    • https://cdn.shopify.com/s/files/1/0435/0276/4184/files/lunakuzolofare.pdf
    • https://cdn.shopify.com/s/files/1/0431/0279/7986/files/rudadapunipaje.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/xonexogivubutujuvulefo.pdf
    • https://dibevupajuwu.files.wordpress.com/2020/07/58729731466.pdf
    • https://bakomawobosi439931692.files.wordpress.com/2020/06/nuxuvusuku.pdf
    • https://zavijon.files.wordpress.com/2020/06/4186955896.pdf
    • https://cdn.shopify.com/s/files/1/0428/3957/2643/files/21435827868.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54903558396.pdf
    • https://cdn.shopify.com/s/files/1/0429/8070/4405/files/52268029230.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/57293260150.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1665/files/74633983729.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/xagiko.pdf
    • https://cdn.shopify.com/s/files/1/0432/4841/8971/files/wikabetikafusove.pdf
    • https://cdn.shopify.com/s/files/1/0429/6255/0940/files/9659430088.pdf
    • https://cdn.shopify.com/s/files/1/0432/8462/7616/files/28912062584.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_off00006f61.bin
23aae4411e8242e0fbda26bdfb6645b262937e6daab878bb1c7caa9b87923bcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F61 5456 bytes
font_01_sfnt_off000081d8.bin
90e025c9955b14727d034a3984847a97ce0a0a097e4ce2f3f3c66a9067e35bdf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81D8 10184 bytes

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