Malicious PDF — malware analysis report

Static analysis result for SHA-256 096a0c6c3d9eace3…

MALICIOUS

PDF

32.3 KB Created: 2020-08-20 06:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3961e65c1f8a6a6d87fbaa5f7cdb7356 SHA-1: 1e71c5a891e9b02ebd4e6992f70c78606f94e439 SHA-256: 096a0c6c3d9eace3914e22260b910a240d43be938f3123fc5704bc1396a339df
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, which is designed to lead users to further malicious content. The document also hosts a large number of external PDF links, many of which are benign, suggesting a link farm or SEO manipulation tactic. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence indicate malicious intent.

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=objective+zoology+pdf+free
    • http://laxovo.campbethelvirginia.org/uploads/1/3/1/3/131398425/fujis.pdf
    • http://files.eframesuk.com/uploads/1/3/0/8/130814124/8742938.pdf
    • http://kozov.iloveacorns.com/uploads/1/3/0/7/130776493/wenoxuwuduxe-letanuzosuw-nenowomitu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7028/3173/files/wenonepox.pdf
    • https://cdn.shopify.com/s/files/1/0433/6769/4501/files/xikefulewuxuliv.pdf
    • https://cdn.shopify.com/s/files/1/0440/6149/1365/files/les_patineurs_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/9289/4105/files/dusixikunomubezivi.pdf
    • https://cdn.shopify.com/s/files/1/0430/1350/5185/files/ab_lounge_ultra.pdf
    • https://cdn.shopify.com/s/files/1/0452/3058/8064/files/investment_banking_glossary.pdf
    • https://cdn.shopify.com/s/files/1/0430/6268/9946/files/jolunizepizivep.pdf
    • https://cdn.shopify.com/s/files/1/0434/8660/9573/files/gcuf_date_sheet_2019_for_affiliated_colleges.pdf
    • https://cdn.shopify.com/s/files/1/0434/0957/1990/files/35863974845.pdf
    • https://cdn.shopify.com/s/files/1/0436/7237/1350/files/gcf_word_problems_6th_grade_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/characteristics_of_literary_language.pdf
    • https://cdn.shopify.com/s/files/1/0437/3974/2369/files/38024755664.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_off00004315.bin
e4979a7def4101da7a8da480bec8415d36473b227f2501c595b5b222dceea502
pdf-font-stream PDF embedded font (sfnt) at offset 0x4315 5392 bytes
font_01_sfnt_off00005593.bin
8c42b3f0908ef82cbd42fc9016ef6dbb5b56a145ab437ef26f6fb7b2350fe199
pdf-font-stream PDF embedded font (sfnt) at offset 0x5593 8996 bytes