Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef67cedea4a9ad98…

MALICIOUS

PDF

51.2 KB Created: 2020-08-04 04:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecd2eb96bbfdc9411b13217ab4d83af4 SHA-1: 91c5d9c2f4c40b6b5c46d352e74ed7cfa35396fe SHA-256: ef67cedea4a9ad9817b096f377f1561f0548873e86404a049953b75d546853b2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a prominent link disguised as a student support attestation, which redirects to a malicious URL (ttraff.cc). This indicates a phishing or social engineering attempt to redirect the user to malicious infrastructure. The PDF also hosts a large number of other PDF links, many hosted on cdn.shopify.com, suggesting a link farm or SEO poisoning tactic to improve search engine ranking for malicious content.

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=attestation+de+prise+en+charge+%25C3%25A9tudiant+pdf
    • http://files.upwellings.com/uploads/1/3/1/6/131607174/c3eb020e.pdf
    • http://files.alphaobsession.com/uploads/1/3/1/8/131856435/5fa44eebfab02.pdf
    • http://rudunik.myfashion-voyage.com/uploads/1/3/0/8/130814058/tumuw.pdf
    • http://files.francesmcmahonward.net/uploads/1/3/0/7/130738912/581593.pdf
    • http://files.andrerowejr.com/uploads/1/3/1/4/131483266/ca4e507432.pdf
    • https://cdn.shopify.com/s/files/1/0431/5722/5638/files/hodori_los_angeles_ca.pdf
    • https://cdn.shopify.com/s/files/1/0431/3455/0177/files/konajebawujubuwugekovam.pdf
    • https://cdn.shopify.com/s/files/1/0433/6100/9829/files/47106669810.pdf
    • https://cdn.shopify.com/s/files/1/0431/0574/7108/files/agriculture_mpsc_books.pdf
    • https://cdn.shopify.com/s/files/1/0434/6390/1334/files/54219177300.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8542/files/91472020546.pdf
    • https://cdn.shopify.com/s/files/1/0434/3028/1377/files/23336193867.pdf
    • https://cdn.shopify.com/s/files/1/0445/8453/4180/files/psicologia_de_la_depresion.pdf
    • https://cdn.shopify.com/s/files/1/0450/7333/4424/files/number_theory_notes_for_bsc.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6517/files/mthode_de_franais_alter_ego_5_c1_c2.pdf
    • https://cdn.shopify.com/s/files/1/0430/9549/0721/files/taturuzosomedefabu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8350/5562/files/dawaxafedutitepexa.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/
    • https://cdn.shopify.com/s/files/1/0434/6390/1334

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008561.bin
a331f63617a20d13b2c6b3b420474c72ac9d7b502d9350101760942ceccfd96a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8561 5516 bytes
font_01_sfnt_off000097e0.bin
d7f36bfc451ce9aa3ec6a6fb9890868e99900d823c14b2ff2c55d9aec143bf9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97E0 12020 bytes

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