Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8df760af70c3a0…

MALICIOUS

PDF

38.7 KB Created: 2020-08-17 05:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c0eeb768577001e8061dcc1c475a34f SHA-1: ccf04d49d0a6b965e9c260c3bdf07a074ae74b31 SHA-256: 5f8df760af70c3a0ad8928ceab64d9afd9d42110519c34e2821d9e912ffa9f51
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. It also features a large number of embedded links to other PDFs hosted on various domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a 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.com/pify?keyword=sheetrock+dust+control+joint+compound+review
    • http://files.rykersonforkittery.org/uploads/1/3/0/7/130739742/fokapofeje.pdf
    • http://files.alexandertechniqueforviolinists.com/uploads/1/3/1/4/131438175/muzijasame.pdf
    • http://files.therestthatworks.com/uploads/1/3/1/3/131379650/1626549.pdf
    • http://files.simplychicbynikki.com/uploads/1/3/0/7/130775970/95bf44.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7042/2180/files/67182271515.pdf
    • https://cdn.shopify.com/s/files/1/0435/6915/2159/files/farujowaku.pdf
    • https://cdn.shopify.com/s/files/1/0428/4828/8934/files/20291416485.pdf
    • https://cdn.shopify.com/s/files/1/0429/0327/3628/files/kikigele.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/85528177344.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/rusadofifexowomafalis.pdf
    • https://cdn.shopify.com/s/files/1/0429/8217/8979/files/nefoxijekupexen.pdf
    • https://cdn.shopify.com/s/files/1/0430/5446/5175/files/erosive_gastritis_treatment_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0433/3928/4645/files/kolamerusevomezoxijarip.pdf
    • https://cdn.shopify.com/s/files/1/0437/3102/6071/files/kukotulelivobana.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_off000057fb.bin
eccd3abfb6705dad85fe80d187935155395f91fd243e406ac1e30972d07c9568
pdf-font-stream PDF embedded font (sfnt) at offset 0x57FB 5500 bytes
font_01_sfnt_off00006a9a.bin
79dbbadc1e4e9f34264018c4dbc7255df7c12c0e5fafe7cff2e632cf9573eee0
pdf-font-stream PDF embedded font (sfnt) at offset 0x6A9A 10320 bytes