Malicious PDF — malware analysis report

Static analysis result for SHA-256 15575a1d075e5be8…

MALICIOUS

PDF

44.6 KB Created: 2020-08-10 22:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4766412dbced828cb1251c08ab083d8 SHA-1: a7db66e3c6843fc8a0481feb613671ed61a7528f SHA-256: 15575a1d075e5be853428e49a3112475c185c1be26ef346a2967f26dc642fc1c
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a redirector link to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to lure users to malicious infrastructure. The ML classifier strongly indicates maliciousness, and the presence of many external links points to a link farm or redirection strategy.

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=equilibrium+economics+pdf
    • http://wogovedi.royalorderkingdomofpoland.org/uploads/1/3/1/4/131407406/675540.pdf
    • http://files.plpseniors.com/uploads/1/3/1/4/131437312/tiwisopiwatopi_ledasapat_fakovivivelopeg_risuwazebeda.pdf
    • http://files.ouhsdra.org/uploads/1/3/2/6/132695472/xivivonupozejut.pdf
    • http://wapopunaz.acauseforcrafting.org/uploads/1/3/2/7/132710592/tisefupap.pdf
    • http://files.doorcountycivilityproject.org/uploads/1/3/1/3/131379054/a992b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/29711131902.pdf
    • https://cdn.shopify.com/s/files/1/0450/4364/6614/files/hemoglobin_formation.pdf
    • https://cdn.shopify.com/s/files/1/0431/7803/3313/files/90319118199.pdf
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/wederexag.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/97971301923.pdf
    • https://cdn.shopify.com/s/files/1/0432/5143/3627/files/zip_codes_murfreesboro_tn.pdf
    • https://cdn.shopify.com/s/files/1/0430/9912/7959/files/40054572576.pdf
    • https://cdn.shopify.com/s/files/1/0431/4798/5053/files/12911872749.pdf
    • https://cdn.shopify.com/s/files/1/0428/3393/6547/files/80921254175.pdf
    • https://cdn.shopify.com/s/files/1/0432/1096/5147/files/98381164947.pdf
    • https://cdn.shopify.com/s/files/1/0434/2513/6797/files/gre_analytical_reasoning_questions_with_answers.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065e3.bin
b752f81113d344983a8c3c77741299f03757cf30584df81f97085e62e7cf5f5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65E3 5316 bytes
font_01_sfnt_off000077d2.bin
39b4885fcf0c38dcda0de33b2823ad35a3b8303d08450a6f7d64fc5ba3c36bb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D2 14468 bytes

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