Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c365882cddadf6…

MALICIOUS

PDF

33.3 KB Created: 2020-08-11 22:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8df94e0fd496db681abf2c65e86ff34 SHA-1: 26e3e526c2c2ddbc896a088d7ac69b9bf1537d45 SHA-256: 34c365882cddadf6c9d5c3c40255f8c0452c7ac8e15094667a204dbc5cabfbe2
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, characteristic of a link farm, designed to lure users into clicking on malicious content. The primary redirector URL is identified as malicious. The document body, though heavily obfuscated, contains text related to 'blouse cutting and stitching pdf in telugu' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly indicated maliciousness.

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=blouse+cutting+and+stitching+pdf+in+telugu
    • http://files.westmontmusicacademy.com/uploads/1/3/1/4/131453588/riletegosotem_soxovojebul_rabolatax_tibuxujejon.pdf
    • http://files.capecoralkayak.com/uploads/1/3/1/3/131378950/5e63e0.pdf
    • http://files.foolscaptheatre.com/uploads/1/3/1/8/131857334/tujuwikafov_vosojow.pdf
    • https://cdn.shopify.com/s/files/1/0429/2149/2643/files/45079519904.pdf
    • https://cdn.shopify.com/s/files/1/0431/7567/4024/files/79282333342.pdf
    • https://cdn.shopify.com/s/files/1/0440/7944/8216/files/kerowebokona.pdf
    • https://cdn.shopify.com/s/files/1/0440/6001/6790/files/23582131985.pdf
    • https://cdn.shopify.com/s/files/1/0447/0145/0396/files/learning_bayesian_networks_neapolitan.pdf
    • https://cdn.shopify.com/s/files/1/0429/5363/8044/files/nizapolejimotu.pdf
    • https://cdn.shopify.com/s/files/1/0428/5438/3782/files/69008821492.pdf
    • https://cdn.shopify.com/s/files/1/0439/3120/5787/files/mefanuxorofadinusu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3179/7668/files/nuzisuteli.pdf
    • https://cdn.shopify.com/s/files/1/0431/2619/4330/files/wokavopizaxuneliwog.pdf
    • https://cdn.shopify.com/s/files/1/0435/1387/2548/files/sajumapituka.pdf
    • https://cdn.shopify.com/s/files/1/0436/9409/6539/files/86680411495.pdf
    • https://cdn.shopify.com/s/files/1/0430/4227/5479/files/92410817766.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_off00004739.bin
77ab8c6482126e6cd97340e23c894b1270e4ae8271c5c9dce4d31873f83b7394
pdf-font-stream PDF embedded font (sfnt) at offset 0x4739 5368 bytes
font_01_sfnt_off0000597e.bin
cdb30280478417830993eb984e78fe3560fd34654c5c66648503dcfc9f3fc28a
pdf-font-stream PDF embedded font (sfnt) at offset 0x597E 8920 bytes