Malicious PDF — malware analysis report

Static analysis result for SHA-256 34aa38742faf293b…

MALICIOUS

PDF

41.6 KB Created: 2020-08-08 14:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2360209c48ea861dfb708afdb7180c64 SHA-1: 0633823aa2d6202723a80db69ca55c7233104f8f SHA-256: 34aa38742faf293b0fa25b75c47191211ff28caae5b08380291eaa4577d4ec4f
154 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically identified as a malicious redirector. The document body text, though heavily obfuscated, contains the URL 'https://ttraff.com/pify?keyword=biology+class+12+pdf+book', which is a critical finding. This suggests the document is designed to lure users to malicious infrastructure under the guise of providing educational material.

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=biology+class+12+pdf+book
    • http://files.wlcbands.com/uploads/1/3/1/1/131163931/2921846.pdf
    • http://files.kreativefutures.co.uk/uploads/1/3/1/8/131856725/3163d8092c414.pdf
    • http://files.lotusandbee.com/uploads/1/3/2/3/132302732/4889272.pdf
    • http://files.adelaide-pilates.com/uploads/1/3/0/7/130739761/zijupepojumoviziwese.pdf
    • https://cdn.shopify.com/s/files/1/0434/7055/3250/files/37077917409.pdf
    • https://cdn.shopify.com/s/files/1/0438/9673/3864/files/20690465205.pdf
    • https://cdn.shopify.com/s/files/1/0433/4754/2175/files/voxesevotipewu.pdf
    • https://cdn.shopify.com/s/files/1/0429/3551/7337/files/46724904675.pdf
    • https://cdn.shopify.com/s/files/1/0433/0848/2710/files/legawopofemawobitufomabin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/letowopebofowebizuwir.pdf
    • https://cdn.shopify.com/s/files/1/0433/6350/0197/files/55880019783.pdf
    • https://cdn.shopify.com/s/files/1/0439/1695/1704/files/30211313196.pdf
    • https://cdn.shopify.com/s/files/1/0433/8394/7414/files/risperidone_davis.pdf
    • https://cdn.shopify.com/s/files/1/0437/3846/4405/files/about_myself_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/6770/3457/files/zotininukek.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_off00006204.bin
d086c46115ce642aff255cfc89333f805c1bc20b87f3cebf9adc6f4bf781361e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6204 5764 bytes
font_01_sfnt_off000075d6.bin
d2a5dfea9258213e80f390e33f71bd9293c25f392c56d48b1048fa1985e95429
pdf-font-stream PDF embedded font (sfnt) at offset 0x75D6 10592 bytes