Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccecb872a4de27d5…

MALICIOUS

PDF

36.7 KB Created: 2020-08-09 16:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11347aa4715188d9c35f41455b33dad4 SHA-1: ea2bcc558d2fc34e5ac0b6a77a02e8d42de63221 SHA-256: ccecb872a4de27d53fa1d703df262491273445d96c54ac4468131616ed3a841d
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely intended to lead the user to a malicious site. The document also contains a large number of embedded links to PDFs hosted on Shopify, suggesting a link farm or SEO poisoning tactic to increase visibility. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of the malicious redirector URL is a strong indicator of a phishing or redirection attack.

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=agitation+and+mixing+pdf
    • http://files.soundingrocket.org/uploads/1/3/1/4/131411688/pokix-garapi.pdf
    • http://sopuxenus.ncyra.org/uploads/1/3/1/4/131482976/zigabutajuxos_fajorema_senotibuwope.pdf
    • http://files.qwerkzfudge.com/uploads/1/3/1/3/131380032/ximinotinamobok_zavixigedu_vusavesuwofu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0695/0557/files/amenaza_de_aborto_cuidados.pdf
    • https://cdn.shopify.com/s/files/1/0429/7143/1065/files/92621389867.pdf
    • https://cdn.shopify.com/s/files/1/0433/1280/8091/files/rice_bran_oil_solvent_extraction_process.pdf
    • https://cdn.shopify.com/s/files/1/0429/3813/8783/files/banking_services_chronicle_july_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/rarigumivala.pdf
    • https://cdn.shopify.com/s/files/1/0433/7192/1573/files/97649658939.pdf
    • https://cdn.shopify.com/s/files/1/0429/9004/3287/files/gixalujowusuwotuwax.pdf
    • https://cdn.shopify.com/s/files/1/0445/8535/3380/files/longman_academic_reading_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/5147/5351/files/serway_faughn_college_physics_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5274/files/62722131751.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_off000053ae.bin
6b7c22100bcf7aeee977f3f3b10c558695c8fb29e168fede393428d2c9f83fe5
pdf-font-stream PDF embedded font (sfnt) at offset 0x53AE 5112 bytes
font_01_sfnt_off00006512.bin
a225b89ad95928b397f01fd4a45f57b0a1d8bbcf2af8de90094b0af608eb1bce
pdf-font-stream PDF embedded font (sfnt) at offset 0x6512 9772 bytes