Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a34fd957481bf35…

MALICIOUS

PDF

49.9 KB Created: 2020-08-24 10:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1a147c884d77e4eb5a59489cf469974 SHA-1: 02f41f83c3a51aa06496c5ca3a88e3e3af6fcc54 SHA-256: 1a34fd957481bf35f3028fe957d2d147108b815791d4b28783788bfca4d36f63
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning model and heuristics indicating malicious redirector links and a link farm. The document body contains a URL pointing to a redirector, which in turn leads to a large number of PDF files hosted on Shopify. This suggests a tactic to distribute content or manipulate search results, potentially leading to further malicious activity.

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=broadsheet+sydney+cbd+lunch
    • http://pejozo.scafone.com/uploads/1/3/1/6/131606490/2cd647be.pdf
    • http://jodaxiw.impulsivelust.com/uploads/1/3/0/8/130814187/dereruna-gesemikevuwo-nevoz-vonomarono.pdf
    • http://files.stephenkozan.com/uploads/1/3/1/4/131406288/tokevikuxavajesorog.pdf
    • https://cdn.shopify.com/s/files/1/0434/9358/9142/files/60615528703.pdf
    • https://cdn.shopify.com/s/files/1/0432/1483/1780/files/76480256251.pdf
    • https://cdn.shopify.com/s/files/1/0429/1028/5990/files/reduce_file_size_acrobat_xi_pro.pdf
    • https://cdn.shopify.com/s/files/1/0433/8706/0378/files/static_gk_capsule_2020_bankersadda.pdf
    • https://cdn.shopify.com/s/files/1/0434/6524/4832/files/introduction_to_forensic_criminal_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0434/8660/9573/files/pikiw.pdf
    • https://cdn.shopify.com/s/files/1/0427/9602/3975/files/sevilla_albeniz_guitar.pdf
    • https://cdn.shopify.com/s/files/1/0430/3192/0794/files/toyota_corolla_verso_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/1571/6513/files/ansible_vs_puppet.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_off000085d7.bin
9700f793eded9846707c87f252b1e6f2e14efee240151c77c5e814a5eaba4b1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x85D7 5316 bytes
font_01_sfnt_off000097ea.bin
0b78e7f1b72870913f37364e0fd6e924ad3680bec546150f406f55d92ab934cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x97EA 10340 bytes