Malicious PDF — malware analysis report

Static analysis result for SHA-256 151936b4ece426f2…

MALICIOUS

PDF

44.2 KB Created: 2020-08-24 01:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e69212c076281f7f379f3318dc9c10de SHA-1: 273b95492cddd33b8c047bf2f27e4eb15fbe553a SHA-256: 151936b4ece426f29763a6aa7a9bd6cd0483afb66d07292cfcc48f4592df9259
174 Risk Score

Malware Insights

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

The PDF contains a direct link to a known malicious redirector, ttraff.com, which is used to obscure the final destination. The document body, though heavily obfuscated, contains text related to 'Army equal opportunity training jko answers' and includes the malicious URL, suggesting a phishing or scam lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm designed to distribute malicious content or engage in SEO manipulation for phishing purposes. The ML classifier also strongly flagged this PDF as malicious.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=army+equal+opportunity+training+jko+answers
    • http://puwonavap.showmethesmile.net/uploads/1/3/1/4/131453325/jobonakavit-zinexata-jajano.pdf
    • http://files.newrichmondwiumc.org/uploads/1/3/0/7/130739153/6245985fd3e85.pdf
    • http://files.orian.us/uploads/1/3/1/4/131438869/rixanovaxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/3374/7878/files/grignard_synthesis_of_triphenylmethanol_lab_report.pdf
    • https://cdn.shopify.com/s/files/1/0432/6660/5211/files/29153511128.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17844710077.pdf
    • https://cdn.shopify.com/s/files/1/0437/7709/7886/files/fowewijusujigefok.pdf
    • https://cdn.shopify.com/s/files/1/0436/1568/2717/files/ipa_othman_moviebox.pdf
    • https://cdn.shopify.com/s/files/1/0430/3595/1257/files/telobanedogajelawipujoke.pdf
    • https://cdn.shopify.com/s/files/1/0429/9443/4207/files/adding_and_subtracting_fractions_worksheet_7th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0429/7926/2623/files/zibudupibonal.pdf
    • https://cdn.shopify.com/s/files/1/0428/3128/2335/files/work_permit_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/4891/9450/files/hot_coffie_gta.pdf
    • https://cdn.shopify.com/s/files/1/0432/6670/3516/files/81240431368.pdf
    • https://cdn.shopify.com/s/files/1/0438/9725/8136/files/53343253295.pdf
    • https://cdn.shopify.com/s/files/1/0434/2661/1357/files/aliments_riches_en_protines.pdf
    • https://cdn.shopify.com/s/files/1/0428/7420/8415/files/58391746240.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005821.bin
635690e4d2b2ee4afbb2b55e4d61c095d5455f273b3d6976b2bbbea132eec9c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5821 5588 bytes
font_01_sfnt_off00006b23.bin
e4b932d44ce5fb2ea4161039f4e76301436883a4610fa5205f4276e19192a357		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B23 10180 bytes
font_02_sfnt_off00008df4.bin
73bb1f519e29941fc98367ae33a8b679223d41029fbf73fb5c585da9ec8c2502		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF4 16204 bytes

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