Malicious PDF — malware analysis report

Static analysis result for SHA-256 6629cc7c61748508…

MALICIOUS

PDF

40.9 KB Created: 2020-08-09 18:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebd90c80fff7b48a19214fc74aaaa8c4 SHA-1: 7a8f73cae4d94f323191dc0a6d255d9ad40197b1 SHA-256: 6629cc7c61748508e2c2767efbcf648f9d211be6f935661b55190f2242ae69f4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to a redirector service (ttraff.com) which is flagged as malicious. The document body, though heavily obfuscated, contains a reference to the same malicious URL, suggesting an attempt to drive traffic to malicious infrastructure. The presence of a large number of external links, many of which are PDFs, indicates a link farm or SEO poisoning attempt, likely to obscure the malicious redirector.

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.com/pify?keyword=social+emotional+development+chart+pdf
    • http://files.stswithunsprimary.org/uploads/1/3/1/4/131407439/rosom-takaxep-limizi-betimujevetadu.pdf
    • http://files.eastshorecf.com/uploads/1/3/1/4/131407705/lanaj.pdf
    • http://files.mil2civmentor.com/uploads/1/3/1/4/131452741/fb1e50a4f7ef.pdf
    • http://files.hrafricaconsulting.com/uploads/1/3/2/8/132814949/a7ba27d995c65.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/8042/3326/files/245322908.pdf
    • https://cdn.shopify.com/s/files/1/0433/5134/3269/files/posupisubogetosa.pdf
    • https://cdn.shopify.com/s/files/1/0434/5095/7991/files/wiwonixipi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9390/8892/files/coin_sorter_walmart.pdf
    • https://cdn.shopify.com/s/files/1/0428/8803/6505/files/que_es_el_desarrollo_psicosocial.pdf
    • https://cdn.shopify.com/s/files/1/0431/9969/2958/files/51650945557.pdf
    • https://cdn.shopify.com/s/files/1/0433/4511/7342/files/80379160607.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/497691616.pdf
    • https://cdn.shopify.com/s/files/1/0433/1218/5499/files/gekasijozonumozu.pdf
    • https://cdn.shopify.com/s/files/1/0440/3780/0086/files/kidov.pdf
    • https://cdn.shopify.com/s/files/1/0433/4475/6901/files/rexusapujeroxepizogafi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5884/0223/files/40625915821.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3640/files/time_and_work_math_in_bengali.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_off000063d3.bin
d7cd58cc261ac420477383a4288b51b0fb6efae549ddab1d57dc8a0f65c0a65e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63D3 5380 bytes
font_01_sfnt_off000075fd.bin
ad8e47da331cbfdff9cd52361729a8e89fe0ccec75c467216ebf71030098f6d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75FD 9560 bytes

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