Malicious PDF — malware analysis report

Static analysis result for SHA-256 685845fba8532545…

MALICIOUS

PDF

45.3 KB Created: 2020-08-09 23:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0fadfb2ca4c1959e3a07a5e958bf5ae SHA-1: d0679f3ce66690021888c6bc870b62babfbdba0e SHA-256: 685845fba8532545fe35e7196929096c07a0666b0962ac058436441e56711f1d
162 Risk Score

Malware Insights

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

The PDF contains a lure related to a motor vehicle bill of sale and embeds numerous links, one of which points to a known malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or engage in SEO manipulation for malicious purposes. No scripts were extracted, but the document body itself contains the malicious URL.

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=motor+vehicle+bill+of+sale+pdf
    • http://files.allstudentsallstandards.org/uploads/1/3/0/8/130813489/zofuwegezexegopunizo.pdf
    • http://files.argylltsi.org/uploads/1/3/1/4/131407435/211665.pdf
    • http://files.alberfrenchflorist.org/uploads/1/3/0/8/130874067/30715.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/97301859000.pdf
    • https://cdn.shopify.com/s/files/1/0438/8447/8632/files/battery_and_magneto_ignition_system.pdf
    • https://cdn.shopify.com/s/files/1/0429/5393/2966/files/fobumonegez.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/casio_g_shock_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/healing_church_workshop.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lorabo.pdf
    • https://cdn.shopify.com/s/files/1/0438/7222/3387/files/acet_entrance_exam_reviewer.pdf
    • https://cdn.shopify.com/s/files/1/0428/2325/4179/files/kubegujajunusaz.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8969/files/allopathic_medicine_book_in_bengali.pdf
    • https://cdn.shopify.com/s/files/1/0434/2385/8850/files/arkansas_drivers_book.pdf
    • https://cdn.shopify.com/s/files/1/0427/7128/4135/files/aerospace_engineering_books_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4903/3627/files/51860488930.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
font_00_sfnt_off000065e4.bin
23d54c699ef387be23972b0e22580bdd3350b5d67fce6dfb054c82c21480f625		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E4 5132 bytes
font_01_sfnt_off00007775.bin
9bab6253a0f08aea413c9db31e20bd08a19231a89cdb820daaf7e02f5a4daba7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7775 10200 bytes
font_02_sfnt_off00009a4a.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A4A 4324 bytes

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