Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9818cf2c5e888ad…

MALICIOUS

PDF

42.1 KB Created: 2020-08-07 03:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13b5c7ca0ff8a97211bed8bfc1c7dfd0 SHA-1: d27210c6d3d29ef9ad981a4af908510a5482e702 SHA-256: f9818cf2c5e888ad6e9d7853e874273bfff0e0e290c814b6c7e47975c892dcbc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged by a machine learning classifier and contains numerous external links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, contains text related to 'abdominal aorta anatomy pdf' and includes the malicious redirector URL, suggesting a lure to a phishing or malware distribution site. The presence of a link farm indicates a deliberate attempt to distribute malicious content.

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=abdominal+aorta+anatomy+pdf
    • http://rekisas.commsailpistakee.org/uploads/1/3/0/7/130739267/7002214.pdf
    • http://files.chrashworks.com/uploads/1/3/1/3/131383510/c7592003a83ba.pdf
    • http://files.adasaccessories.com/uploads/1/3/2/6/132681398/galaxonafonewol.pdf
    • https://cdn.shopify.com/s/files/1/0433/0346/9221/files/67316148948.pdf
    • https://cdn.shopify.com/s/files/1/0432/3305/0779/files/averrhoa_bilimbi_benefits.pdf
    • https://cdn.shopify.com/s/files/1/0430/7435/5351/files/2806633007.pdf
    • https://cdn.shopify.com/s/files/1/0434/3706/4344/files/dojonijabenitisuzis.pdf
    • https://cdn.shopify.com/s/files/1/0434/0455/8488/files/newusuzodomawelokajizegap.pdf
    • https://cdn.shopify.com/s/files/1/0435/5896/1320/files/nowigo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0195/3952/files/94522819008.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9966/files/92837205812.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57727452667.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2214/files/minecraft_skyrim_texture_packs.pdf
    • https://cdn.shopify.com/s/files/1/0431/6528/6566/files/luliseviwafixag.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005bf2.bin
086a73e3dec7085fd9380614d03efb3d814d0e7d5ab69e8993eaf2dc075008a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5BF2 4912 bytes
font_01_sfnt_off00006c80.bin
3e4707459c03417012edae069eaa23747f6c36691f1525391f031d334a5e4298
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C80 9732 bytes
font_02_sfnt_off00008dbd.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DBD 4324 bytes