Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8e35957277f2816…

MALICIOUS

PDF

43.6 KB Created: 2020-09-03 01:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebd02c132d2fb304e7a0445651e2d49a SHA-1: 25e1cba4150fcce1c7da934a7e988238124e8214 SHA-256: f8e35957277f2816fcd21a36904f8bf9851192cd07acd58bd56ed856755a5796
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to harmful content. The document body, though heavily obfuscated, contains the same URL. The presence of a large number of external PDF links, many pointing to static.usrfiles.com, suggests a link farm designed to improve search engine ranking for the malicious URL. No scripts were extracted, and the PDF structure itself is the primary vector.

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.link/wix?keyword=lantunan+surat+al+kahfi+muzammil+hasballah
    • https://static.usrfiles.com/ugd/f1c748_1e0480369d684b439e187f49291869cd.pdf
    • https://static.usrfiles.com/ugd/b8c837_efd35249ba134561b3e8a6ddc2c84531.pdf
    • https://static.usrfiles.com/ugd/b8c837_0c98e0e70f5b47a8b89258136dead7be.pdf
    • https://static.usrfiles.com/ugd/8a419d_196220f7cb7b4322abfaf2ba38b8a6b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_627bd5e6270a411586a7054f928fac01.pdf
    • https://cdn.shopify.com/s/files/1/0437/4321/5767/files/uncle_bob_clean_architecture.pdf
    • https://cdn.shopify.com/s/files/1/0431/7842/6534/files/honda_hrr216vka_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/0180/7007/files/kijulivasadegutab.pdf
    • https://cdn.shopify.com/s/files/1/0440/4481/2438/files/bavawapepipibugakigaxomux.pdf
    • https://cdn.shopify.com/s/files/1/0432/6594/9862/files/42622770840.pdf
    • https://cdn.shopify.com/s/files/1/0433/5524/2655/files/hartley_and_colpitts_oscillator.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8401/files/28550576106.pdf
    • https://cdn.shopify.com/s/files/1/0447/3962/5111/files/publication_design_workbook.pdf
    • https://static.usrfiles.com/ugd/5cf23b_2f4dced26a954699a62c4b105fe61eb7.pdf
    • https://static.usrfiles.com/ugd/35dc59_34f67b5f0c6749c9881c2c031fbcfd3a.pdf
    • https://static.usrfiles.com/ugd/a2c2bc_fa77f321a22a4408813a2ad40dde8350.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_off00006832.bin
6a3dae78565542a8ce558ab08d5cdd8fa8d5426d41ddee8832997090756c9071
pdf-font-stream PDF embedded font (sfnt) at offset 0x6832 5204 bytes
font_01_sfnt_off000079c7.bin
76e34c2ac196b50b252839cd70e471543a4d270c4f2eff6a375aa809cdf9fe14
pdf-font-stream PDF embedded font (sfnt) at offset 0x79C7 12516 bytes