Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d216b55d36e751…

MALICIOUS

PDF

44.5 KB Created: 2020-09-16 10:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1515ecfd5ac0256b65913f1d97bbeba7 SHA-1: ca0e13db525e4863442f1715ddbb4c38fc3daf4c SHA-256: f1d216b55d36e75132372158c33889c9a88b3553c5e78605934c0f142d56af52
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.link, which is disguised as a service manual. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the target URL and references to a service manual, reinforcing the lure. The presence of numerous external PDF links suggests a link farm or redirection strategy.

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/pify?keyword=2007+mazdaspeed+3+service+manual
    • http://files.jeffbrettart.com/uploads/1/3/2/7/132712088/fidamap.pdf
    • http://files.gayatripublicschool.org/uploads/1/3/1/3/131380440/modalasulu_vagukos.pdf
    • http://files.emeliejanssonfoto.com/uploads/1/3/1/1/131163578/530e09ad4d35.pdf
    • http://files.valiantfew.org/uploads/1/3/1/3/131383864/b6f28c7931720c7.pdf
    • https://static.usrfiles.com/ugd/a4c1fa_0e9a5d6384bc446498d27f5a1780b2b1.pdf
    • https://static.usrfiles.com/ugd/0d002d_63f35d2eba354e3299c7547d3bc208c5.pdf
    • https://static.usrfiles.com/ugd/cb2bed_736e908eee954bb7907617fb2d2f53fb.pdf
    • https://static.usrfiles.com/ugd/2f07a1_e82bfa4924b24ef793b8b3c24d6c3c92.pdf
    • https://static.usrfiles.com/ugd/762c1a_e49fc25d7c2547f18dc07889392cd3ab.pdf
    • https://static.usrfiles.com/ugd/b42fd6_1e3089f3d0de40ba8a015ed254c1348a.pdf
    • https://static.usrfiles.com/ugd/8d5d69_75a6a4c185ea4fb89496e1b368f3d86b.pdf
    • https://static.usrfiles.com/ugd/18f527_afd2f59b8466427e8842b4f93a2f22b6.pdf
    • https://static.usrfiles.com/ugd/5a4c69_65093e40ff8e4dad96022845ae85a5cd.pdf
    • https://static.usrfiles.com/ugd/e2a635_a911d30215d447829f6f2e04add4cb41.pdf
    • https://static.usrfiles.com/ugd/c83fdb_2e49888ba94c4d3ebc04754cd98613f6.pdf
    • https://static.usrfiles.com/ugd/b16523_b2e867423d574e27b80e945c3e7e686f.pdf
    • https://static.usrfiles.com/ugd/83f04e_bebad72ac12247a4b8a713ee7b28feb7.pdf
    • https://static.usrfiles.com/ugd/13ae68_ecb9d72530a7454d8a24087d3a9ac260.pdf
    • https://static.usrfiles.com/ugd/3bca44_2daf035c1a6c48099a910393f7e5ceb9.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_off00006dc7.bin
40d52c41e9fd1fad4f88c74cd27ebf7d8e99d10916f0379f6165c4ddc737fecc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DC7 5752 bytes
font_01_sfnt_off00008153.bin
d3feeac51b1e8dfd5273bd11abb100925b2290ca4166cbebc1ea36fed532e072		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8153 10256 bytes

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