Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b75dc6e2b20bed…

MALICIOUS

PDF

48.2 KB Created: 2020-08-04 01:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a51fec03f8e95401ca0a077f01f24be SHA-1: 6358109cdd09b6f6a6e9701846992c07ef691fc6 SHA-256: 32b75dc6e2b20bed2e43286f0e1aefda4a47624da0b24ce035dade823cfaaa2e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many pointing to a redirector service, indicating a link farm or redirection attack. The primary URL `https://ttraff.ru/pify?keyword=online+pdf+accessibility+checker` suggests a lure related to document accessibility. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and embedded links are indicative of a malicious redirection campaign.

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=online+pdf+accessibility+checker
    • http://gevesoko.reflectionssj.com/uploads/1/3/1/8/131856543/fojesufoluwuzez-tadinovabina-tufunavajo.pdf
    • http://files.gulfcoastfrenchbulldogs.com/uploads/1/3/0/8/130813546/685028dda.pdf
    • http://files.ignitionnorthwest.org/uploads/1/3/1/4/131438759/3065152.pdf
    • http://files.tjpfitness.com/uploads/1/3/2/6/132695575/1145300.pdf
    • http://files.oppenheimerindustries.com/uploads/1/3/1/4/131438018/jedabotomafe.pdf
    • https://cdn.shopify.com/s/files/1/0429/1608/5916/files/69461269868.pdf
    • https://cdn.shopify.com/s/files/1/0437/5583/1445/files/94918015056.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8541/files/jeviduxoribawafagepexak.pdf
    • https://cdn.shopify.com/s/files/1/0434/5249/8070/files/65604135268.pdf
    • https://cdn.shopify.com/s/files/1/0428/4855/1068/files/62279600373.pdf
    • https://cdn.shopify.com/s/files/1/0434/1468/3813/files/wubina.pdf
    • https://cdn.shopify.com/s/files/1/0434/4266/7676/files/22041388444.pdf
    • https://cdn.shopify.com/s/files/1/0435/3343/5032/files/aia_a305.pdf
    • https://cdn.shopify.com/s/files/1/0431/0731/9974/files/53315521073.pdf
    • https://cdn.shopify.com/s/files/1/0430/6999/7207/files/38957703186.pdf
    • https://cdn.shopify.com/s/files/1/0431/1947/6896/files/76047532947.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_off00007df0.bin
650831be1098884f4f27d3713f0269dd0df4f4adddfd8e7b3125ae22d8389273
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF0 5576 bytes
font_01_sfnt_off000090e2.bin
70c9cc51359b119d81d6f810369ae7b66cb11414650689ffcc1332c733c928c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x90E2 10320 bytes