Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44bfac525e26396…

MALICIOUS

PDF

42.3 KB Created: 2020-09-06 19:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcd342aa5ccb5bf182a48b1513931667 SHA-1: 4ab75074b46576f5e3ca23aeeb1cf98bfd6ecaa4 SHA-256: f44bfac525e263962e1ac9b215cd4f47af4cd8e6a08505a631a0aba124ee61c0
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting the document's primary purpose is to manipulate search engine results or distribute other malicious content. No scripts were extracted from this sample.

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.me/pify?keyword=divide+using+long+division+worksheet+algebra+2
    • https://static.usrfiles.com/ugd/c0b427_506b5764ccdd42f48c3eb6c5da38b248.pdf
    • https://static.usrfiles.com/ugd/a2e20a_f12993812edf44c499787896031ea1b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_d5910a8b2efe4dafa99e18bd97a813a8.pdf
    • https://static.usrfiles.com/ugd/87b9a8_de703d0e869b4d73b210c237acbc0b05.pdf
    • https://static.usrfiles.com/ugd/b1277d_20250bb316d240a2947a69db8c560797.pdf
    • https://cdn.shopify.com/s/files/1/0459/9844/0605/files/i_drive_your_truck_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/2280/3366/files/business_information_systems_jobs.pdf
    • https://cdn.shopify.com/s/files/1/0439/1292/1256/files/vulawotarerivosunoxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/3033/8966/files/zepipurix.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dusegu.pdf
    • https://static.usrfiles.com/ugd/c20ea7_b2ed1b2e6ff0452c9378f6321f3b0a34.pdf
    • https://static.usrfiles.com/ugd/36d413_169082fe3cc849b99cf0a8583ab01c33.pdf
    • https://static.usrfiles.com/ugd/40512e_5e7c8634beff472684e7f467a4257cb2.pdf
    • https://static.usrfiles.com/ugd/7f929b_63d9bddbdc2643198a59b9e6bd61747e.pdf
    • https://static.usrfiles.com/ugd/63d3ad_6a0434e0427645d08f5474e4f31e7f66.pdf
    • https://static.usrfiles.com/ugd/23e9be_e303b92e42064fecac6d5588fa78bba9.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_off000066c1.bin
e56090bc269c1674508d3868444a49860330b07d66f99aa511518645665f465a
pdf-font-stream PDF embedded font (sfnt) at offset 0x66C1 5576 bytes
font_01_sfnt_off000079c7.bin
3edda3d929b90ec009b5b5e69f54a3b061441158c86501c8e8eea2b951e09cff
pdf-font-stream PDF embedded font (sfnt) at offset 0x79C7 10088 bytes