Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbeb6e24a565e4d5…

MALICIOUS

PDF

46.0 KB Created: 2020-08-19 00:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c719f5a312673844e5092c8980f66e4f SHA-1: a84a77e8d00dd25b73096f23fff0ed4a979d669f SHA-256: dbeb6e24a565e4d574c291687f9f98b089cb3f09850de3e2b89efc03c065ecff
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, many of which point to Shopify-hosted PDF files, suggesting a link farm for SEO manipulation or content distribution. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which further indicates malicious intent. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the extensive link farm and the presence of a malicious redirector are strong indicators of a campaign designed to lure users to malicious sites or manipulate search results.

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=cessna+310d+performance
    • http://files.homesewnbycarolyn.com/uploads/1/3/2/3/132303270/2358905.pdf
    • http://files.yorkstone.ca/uploads/1/3/0/8/130874064/7431978.pdf
    • http://files.kghypnobirthingsouth.com/uploads/1/3/1/4/131406258/6924360.pdf
    • http://kofuba.stpeterslimpsfield.org/uploads/1/3/2/6/132696111/7837909.pdf
    • http://files.netkienterprises.com/uploads/1/3/0/9/130969480/gokijibofad.pdf
    • https://cdn.shopify.com/s/files/1/0432/6536/0034/files/corpus_christi_primary_school_glasgow_uniform.pdf
    • https://cdn.shopify.com/s/files/1/0449/7843/8302/files/eamcet_seat_allotment_order.pdf
    • https://cdn.shopify.com/s/files/1/0431/8478/3509/files/zalupef.pdf
    • https://cdn.shopify.com/s/files/1/0436/9717/6741/files/cardiomegalia_en_nios.pdf
    • https://cdn.shopify.com/s/files/1/0435/6148/4447/files/reading_certificate_templates.pdf
    • https://cdn.shopify.com/s/files/1/0433/6913/6280/files/zevokonezezodunuzapata.pdf
    • https://cdn.shopify.com/s/files/1/0438/9116/3291/files/grade_10_physical_science_textbook_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/55864873889.pdf
    • https://cdn.shopify.com/s/files/1/0437/1290/5384/files/jovepemag.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5093/files/guvax.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_off00007357.bin
9919e4bbce54093a72ebbf54fdaf560d9eb1348860f4e2f5ca76fc0bc508dcb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7357 5532 bytes
font_01_sfnt_off0000860a.bin
6d030c60f93e05c0581804582fe37aa237b5d41a519fb4aaf27ee1485209460d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x860A 10984 bytes

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