Malicious PDF — malware analysis report

Static analysis result for SHA-256 508bdbbaa02702ad…

MALICIOUS

PDF

41.7 KB Created: 2020-08-28 12:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e303116548f4ecc9910ce58fd50485cc SHA-1: 6e86eb71b4d9814ec6829ddbd5c8b00a97c083ab SHA-256: 508bdbbaa02702ad815be009de890060fa4ef085173d0bee80b139224f022e06
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as educational content, specifically 'number patterns worksheets grade 8 pdf'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the link leads to known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the target URL and other PDF links, suggesting a link farm or redirection tactic.

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=number+patterns+worksheets+grade+8+pdf
    • http://files.dkfipta.org/uploads/1/3/1/4/131453684/rikikamupetukoj-zifukopavapu-gewene.pdf
    • http://files.branchlutheranschoolshaiti.org/uploads/1/3/0/7/130739456/c3f3a31.pdf
    • http://zogozexoz.enlivenhere.com/uploads/1/3/0/9/130969162/1745223.pdf
    • https://cdn.shopify.com/s/files/1/0429/5933/9679/files/92686189516.pdf
    • https://cdn.shopify.com/s/files/1/0433/7516/5594/files/41951490779.pdf
    • https://cdn.shopify.com/s/files/1/0431/6102/6719/files/28257208919.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/cardiovascular_endurance_definition.pdf
    • https://cdn.shopify.com/s/files/1/0432/6896/4520/files/82690507279.pdf
    • https://cdn.shopify.com/s/files/1/0428/6346/0508/files/nolarupibafuwa.pdf
    • https://cdn.shopify.com/s/files/1/0433/2145/8853/files/98298120210.pdf
    • https://cdn.shopify.com/s/files/1/0437/5294/7873/files/22480182260.pdf
    • https://cdn.shopify.com/s/files/1/0428/1863/3894/files/new_general_mathematics_textbook_download.pdf
    • https://cdn.shopify.com/s/files/1/0461/4884/5731/files/manorama_max_app_apk.pdf
    • https://cdn.shopify.com/s/files/1/0436/6319/6310/files/futuristic_helmet_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/0191/3244/files/dimupavonavibida.pdf
    • https://cdn.shopify.com/s/files/1/0436/9602/9864/files/65695299100.pdf
    • https://cdn.shopify.com/s/files/1/0429/4977/1427/files/advanced_calculus_2.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_off000061fe.bin
42530bde7426dc1683094198cd3b5cf110dd64cb78d802bd632550fb44bdff0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61FE 5880 bytes
font_01_sfnt_off000075e1.bin
f1b495780d738daa58aed72025b6f24cd6d734aabaa353759a2e72616ca0907a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75E1 10428 bytes

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