Malicious PDF — malware analysis report

Static analysis result for SHA-256 7315915e32c28c80…

MALICIOUS

PDF

53.6 KB Created: 2020-08-14 02:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c14e6534ac494df5008a494f7c48a8bc SHA-1: 7a2bae8d7957e6eea1607ce9062e6ab1a447e6b7 SHA-256: 7315915e32c28c80e8b239e90819d7bd1629efd92a94d9bef9813a9d8a148a5a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but also includes the malicious URL, suggesting an attempt to lure users to a harmful site.

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.ru/pify?keyword=a+d+c+a+computer+full+form
    • http://files.1poundchocolateartscollective.com/uploads/1/3/1/0/131071277/zunupovapewive_xaguzesof_nibixoxekefu.pdf
    • http://wuratiwik.dssala.org/uploads/1/3/1/4/131482993/7651986.pdf
    • http://files.petalcup.com/uploads/1/3/1/3/131398479/gebober.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4291/3955/files/fitness_assessment_form_personal_trainer.pdf
    • https://cdn.shopify.com/s/files/1/0429/1290/7427/files/83752130971.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tozonolemudafolafoxi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4986/8712/files/35239273077.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2384/files/8947771006.pdf
    • https://cdn.shopify.com/s/files/1/0441/2126/0184/files/romeo_and_juliet_balcony_scene_script.pdf
    • https://cdn.shopify.com/s/files/1/0429/6956/3290/files/67702731873.pdf
    • https://cdn.shopify.com/s/files/1/0435/6354/8833/files/66001698862.pdf
    • https://cdn.shopify.com/s/files/1/0429/2198/4166/files/sipewitakara.pdf
    • https://cdn.shopify.com/s/files/1/0427/9762/9596/files/99489667833.pdf
    • https://cdn.shopify.com/s/files/1/0433/9623/5415/files/zezoxenulavuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7318/3637/files/19449596035.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000aae8.bin
41a78c0fc56cf155b7a4491df984fa9da9ab713ef2dd13831e51daf65eb17f9b		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAAE8 9584 bytes
font_00_sfnt_off00006bcf.bin
82dc263bfc74a965b7369a0d35da99017a97d08f6dab7d30f0d0ef45b5d1ec25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BCF 5112 bytes
font_01_sfnt_off00007d1a.bin
7048aa90b57236c20126fe34ea1353d4e1b986534f43f5eec96e76020d7e6b2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D1A 14756 bytes

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