Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e7c2403b0e619c…

MALICIOUS

PDF

48.4 KB Created: 2020-09-03 02:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbab044b4d29a98ee88461c0789e58bc SHA-1: 59b8d612311b43816290249cd66aef60b968c705 SHA-256: 50e7c2403b0e619c3b900def1064fb8153ed97f0a99afc0ed0358b119955ec32
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as crossword puzzle answers, leading to a malicious redirector at ttraff.com. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the lure text and the malicious URL. The presence of numerous benign-looking PDF links hosted on static.usrfiles.com suggests a tactic to mask the malicious redirector.

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=crossword+puzzle+answers+for+today+uk
    • https://static.usrfiles.com/ugd/70a38d_fda80fa3c5144299b4a6d82133261be4.pdf
    • https://static.usrfiles.com/ugd/eb6612_9971e06214c5401c90665f3bed1ea9e3.pdf
    • https://static.usrfiles.com/ugd/74e9cf_1f1bd94e44d047f5a33a6dbb402cdaf5.pdf
    • https://static.usrfiles.com/ugd/09273f_fcac040aefdd436ebe1409046e7b46c2.pdf
    • https://static.usrfiles.com/ugd/db93e9_736737984dd141d29bd65d0de32d0bee.pdf
    • https://static.usrfiles.com/ugd/eaf48f_5b20d4874f4847a28ead97fbb49f880d.pdf
    • https://static.usrfiles.com/ugd/a91264_05605275946f4e4690711d258c37e319.pdf
    • https://static.usrfiles.com/ugd/de3d83_ab9a255aa5774f00ac833dcb9dbd0462.pdf
    • https://static.usrfiles.com/ugd/b8c837_470c600901784a6480168fd239ba6a75.pdf
    • https://cdn.shopify.com/s/files/1/0428/3770/4867/files/59978127317.pdf
    • https://cdn.shopify.com/s/files/1/0438/6373/6485/files/top_games_2018_pc_free.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_off00007fe5.bin
b95d5cede6df4e9b195895d5eb028481687a4885bf569a1043b713bfbbb1b9c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE5 5248 bytes
font_01_sfnt_off000091ef.bin
670df0347ee505748cfe3f046101e0327e986e5e1b7ce44926c916ac6fd50ef5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91EF 10180 bytes

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