Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7e9c0e1af119df…

MALICIOUS

PDF

55.6 KB Created: 2020-08-31 18:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d967a28b8107c4c47a220ef21926f225 SHA-1: e365ff13703b8543792b0986bca30458073e786f SHA-256: 4f7e9c0e1af119dfcb97aed4abc34118d26606c223dc1fa73ab699703707fa61
152 Risk Score

Malware Insights

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

The PDF document contains a malicious redirector link, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic, pointing to 'https://ttraff.cc/wix?keyword=free+restaurant+brochure+templates+psd'. This indicates a phishing or scam attempt, likely to lead the user to a malicious site. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same suspicious URL and references to brochure templates, reinforcing the lure.

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/wix?keyword=free+restaurant+brochure+templates+psd
    • https://static.usrfiles.com/ugd/5899d5_c6403634c9fb4be9ae2e39ee169896eb.pdf
    • https://static.usrfiles.com/ugd/b8c837_004b04228d004325abd11dc9426fcc80.pdf
    • https://static.usrfiles.com/ugd/19ce5d_f2eaffd486ae41b48045689891a7122f.pdf
    • https://cdn.shopify.com/s/files/1/0437/1503/5291/files/81451698992.pdf
    • https://cdn.shopify.com/s/files/1/0428/6591/8118/files/33031908717.pdf
    • https://cdn.shopify.com/s/files/1/0432/7063/5680/files/anonytun_for_pc.pdf
    • https://cdn.shopify.com/s/files/1/0436/5864/1561/files/82930178779.pdf
    • https://cdn.shopify.com/s/files/1/0435/8393/0527/files/77513200240.pdf
    • https://cdn.shopify.com/s/files/1/0434/5774/0957/files/synonyms_and_antonyms_year_6_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0434/0216/6428/files/89025417002.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/tout_ce_qu27_il_voudra.pdf
    • https://cdn.shopify.com/s/files/1/0437/6264/7192/files/45073800757.pdf
    • https://cdn.shopify.com/s/files/1/0448/8734/3271/files/32233847595.pdf
    • https://cdn.shopify.com/s/files/1/0437/0448/3993/files/california_king_snake_feeding_guide.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_off00009b96.bin
e5e61562223472548f222dbdfcd82c5d220af606a4e06cc52e700657d194ab03
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B96 5408 bytes
font_01_sfnt_off0000adc7.bin
0b273838d1513dbc5a7e2286f3e2179a4c9b4eed267f52099b08765f0d1da3d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xADC7 10352 bytes