Malicious PDF — malware analysis report

Static analysis result for SHA-256 037dcecfd870b022…

MALICIOUS

PDF

41.5 KB Created: 2020-08-02 16:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f3b37a3f5b4306c3fe613431cacbf375 SHA-1: 7ca8cf726533dd56d30e1b3c979a87362d704845 SHA-256: 037dcecfd870b022ec2f82310540efee866ca21ab630fa06514ab2db4d6de8fe
194 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 'PDF_MALICIOUS_REDIRECTOR_LINK' pointing to 'https://ttraff.cc/pify?keyword=kingkutter+finish+mower+parts'. Another heuristic identified a 'PDF_SEO_LINK_FARM' with 17 external PDF links, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of the link farm, suggesting a scheme to drive traffic to malicious or spam content.

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=kingkutter+finish+mower+parts
    • http://files.arlingtonteosinte.org/uploads/1/3/1/4/131406629/vusiwipa.pdf
    • http://files.chalfontyogaandmeditationcenter.com/uploads/1/3/1/6/131636843/9442431.pdf
    • http://files.thekissinglipsofamerica.com/uploads/1/3/0/7/130739678/wuputipinivop.pdf
    • http://files.trinitybiblechurchglassboro.com/uploads/1/3/0/7/130775934/cc5b6074f3d66f1.pdf
    • http://files.ultrabender.com/uploads/1/3/1/4/131407106/4412152.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5942/0063/files/damovilopuru.pdf
    • https://cdn.shopify.com/s/files/1/0437/8384/8097/files/58003042120.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7293/files/37033772539.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/13908697451.pdf
    • https://cdn.shopify.com/s/files/1/0428/3655/7987/files/hp_smart_array_p410i_license_key.pdf
    • https://cdn.shopify.com/s/files/1/0432/5254/7739/files/30485050322.pdf
    • https://cdn.shopify.com/s/files/1/0436/3934/1216/files/celebrate_recovery_lesson_8.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/kejowopete.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/47176734503.pdf
    • https://cdn.shopify.com/s/files/1/0429/2352/4259/files/ritaxibivobaveso.pdf
    • https://cdn.shopify.com/s/files/1/0431/1446/3394/files/bewinowivenulodosoxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3146/1016/files/gipodetofagapovixakaxanub.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_off0000613d.bin
1fbdfae8466fa9c9726080d3f30a67421156712f9ec165f9d6946018f75982c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x613D 5408 bytes
font_01_sfnt_off00007394.bin
dd9168aa750a37397da43ae931ebfdc785752990c40d59a3823a4168cd94c520		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7394 10556 bytes

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