Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6af903f3463b42f…

MALICIOUS

PDF

34.4 KB Created: 2020-08-23 18:42:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18fe77bf58dbaa483155189bfe58ebb8 SHA-1: 126813213a5043850c015eb8fe21d64a75e9dcff SHA-256: c6af903f3463b42ffe6b3e514dd59b4ce3760597af5b8c7fb2aca9ccf935448f
152 Risk Score

Malware Insights

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

The PDF contains a deceptive "Arket uk size guide" lure and embeds a large number of links. One of these links, https://ttraff.com/pify?keyword=arket+uk+size+guide, points to a known malicious redirector. The presence of numerous links to external PDFs, many hosted on Shopify, suggests a link farm or redirection strategy to obscure the final malicious destination. The ML classifier also strongly indicated maliciousness.

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=arket+uk+size+guide
    • http://naxuvawej.principledprincipals.com/uploads/1/3/0/8/130813528/sijezoba.pdf
    • http://files.savvytravelsisters.com/uploads/1/3/0/7/130775484/7462282.pdf
    • https://cdn.shopify.com/s/files/1/0433/8312/8214/files/vovepumupu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4153/7696/files/cefr_a2_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/4818/1666/files/resusekobiw.pdf
    • https://cdn.shopify.com/s/files/1/0457/7224/3110/files/k_p_c_l_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0435/7180/6366/files/82685708880.pdf
    • https://cdn.shopify.com/s/files/1/0433/8129/3221/files/89594754562.pdf
    • https://cdn.shopify.com/s/files/1/0429/5327/7603/files/kayarian_ng_salita_worksheet_grade_3.pdf
    • https://cdn.shopify.com/s/files/1/0427/9789/1751/files/serasitenidupurigoribatib.pdf
    • https://cdn.shopify.com/s/files/1/0433/7968/7587/files/16251196468.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a3d.bin
c5131a9e236e8575505be72c0f968f8f529d69bd767b8955da1f7afaa2821ed4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A3D 4856 bytes
font_01_sfnt_off00005adb.bin
b2cebdc035f750c9d1824ceb8e4f8e1530ba62a7e3c87369af8850ebd80fec62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADB 10292 bytes

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