Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f35e485d6ce462f…

MALICIOUS

PDF

45.6 KB Created: 2020-08-10 04:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 467b3c2dfc479734ee585e7cf1cb7d3c SHA-1: b85835cbf1ed4091518aaaff8e747ed26cc929dc SHA-256: 0f35e485d6ce462f7817de953bc44c5facc5ca8573abffbd52126fa6ced808be
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to Shopify domains, suggesting a link farm for SEO manipulation or to host malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.cc/pify?keyword=article+exercise+worksheet+pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the same malicious URL and other Shopify links, reinforcing the attack pattern.

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.cc/pify?keyword=article+exercise+worksheet+pdf
    • http://files.theglasscarousel.com/uploads/1/3/2/3/132303270/9013606.pdf
    • http://files.jennypegg.com/uploads/1/3/1/8/131857114/lobemolazuna.pdf
    • http://files.superiormachineandfab.com/uploads/1/3/2/8/132815154/5810631.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0451/7065/5381/files/skf_bearing_number_identification.pdf
    • https://cdn.shopify.com/s/files/1/0435/7727/8627/files/fupamomolaresijeja.pdf
    • https://cdn.shopify.com/s/files/1/0437/1467/4841/files/sevojilupinotazolotufuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/2748/1255/files/tivipinenabosagawi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32150460784.pdf
    • https://cdn.shopify.com/s/files/1/0438/0459/0242/files/26920558266.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mupuxisupevijerabufogete.pdf
    • https://cdn.shopify.com/s/files/1/0430/6803/1143/files/nilegodokipo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xifenawapuvesuf.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/nosobenugenavapob.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/tokazeveguxobimodov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/denikiv.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_off00006e56.bin
f27a6887e2cca031af8e843a5337ed15a723e75ac9e481a13f2139f84448cc24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E56 5244 bytes
font_01_sfnt_off00008045.bin
c6a56fd00f66bec10778c38a826f7d268a778067c60ce8d9f14e608a3e899532		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8045 12944 bytes

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