Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2fedd144ef002f…

MALICIOUS

PDF

43.0 KB Created: 2020-08-09 19:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb11b5f221c718b2ae8dd6b479d9ca7b SHA-1: 38ce57da681bf8ea812463f116efe7bf07016a01 SHA-256: 9d2fedd144ef002f7b0b52d2e197a1f2a2e17d874be23b07269dd1723b6cbc11
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting the primary goal is SEO manipulation or traffic redirection rather than direct content delivery. The ML classifier also strongly flagged this PDF as malicious.

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=difference+between+compiler+interpreter+and+assembler+pdf
    • http://jafig.quranandhadith.co.uk/uploads/1/3/2/7/132740978/6e8c56.pdf
    • http://files.commercialstreetharrogate.com/uploads/1/3/0/7/130740212/c53bff3.pdf
    • http://fipoxise.securefire.co.uk/uploads/1/3/1/4/131438379/worezepasebu.pdf
    • https://cdn.shopify.com/s/files/1/0441/1867/1512/files/bronislaw_malinowski_theory_of_needs.pdf
    • https://cdn.shopify.com/s/files/1/0431/4018/6268/files/antisocial_theory.pdf
    • https://cdn.shopify.com/s/files/1/0439/9074/5246/files/36702079477.pdf
    • https://cdn.shopify.com/s/files/1/0430/4506/0762/files/black_panther_symbolism.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lewajoranuputefikilos.pdf
    • https://cdn.shopify.com/s/files/1/0431/3543/4901/files/93926545667.pdf
    • https://cdn.shopify.com/s/files/1/0432/2761/1295/files/zugoporadevutula.pdf
    • https://cdn.shopify.com/s/files/1/0431/1695/3767/files/mijamigawudigoze.pdf
    • https://cdn.shopify.com/s/files/1/0433/9377/7827/files/6632846326.pdf
    • https://cdn.shopify.com/s/files/1/0430/7740/2778/files/69181634405.pdf
    • https://cdn.shopify.com/s/files/1/0433/5799/5160/files/grandmaster_repertoire.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_off0000698f.bin
9f6365733562bb62d8f1b376697e3f2ea570a3e93a66772540ea442ffe78a794
pdf-font-stream PDF embedded font (sfnt) at offset 0x698F 5532 bytes
font_01_sfnt_off00007c57.bin
04266401864fb9c6fdfa08179328677ac27c7e7a044cc86233eccde98deab3b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C57 10120 bytes