Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbca00ce8dc611ef…

MALICIOUS

PDF

41.6 KB Created: 2020-08-11 09:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5e22545e31387ba61ab3131294ad0f9 SHA-1: d16dd0d0d5f74f6f0fcd268c51aea39e55aa38b7 SHA-256: fbca00ce8dc611ef5dab3f670df73a88236b11644dd3f7ed19e2557dc861f322
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.cc/wb?keyword=creating%20fillable%20pdf%20forms%20illustrator'. This URL is likely used to direct users to malicious content. The document body, though heavily obfuscated, contains similar URLs and appears to be a lure related to PDF form creation. The ML classifier also strongly indicated maliciousness.

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/wb?keyword=creating%20fillable%20pdf%20forms%20illustrator
    • http://files.thehappyplacecafe.com/uploads/1/3/0/8/130874213/bozamigu.pdf
    • http://vigulu.loudouninvitational.com/uploads/1/3/2/8/132815002/fusotok.pdf
    • http://files.synergytherapiesofkc.com/uploads/1/3/0/7/130775393/kijoduvumixu.pdf
    • http://files.maraamdwidar.com/uploads/1/3/1/8/131856919/5095985.pdf
    • http://xadasux.greatdeerchase.org/uploads/1/3/1/6/131607163/3120784.pdf
    • https://cdn.shopify
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fulefevizurosojasi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4642/8059/files/31196596842.pdf
    • https://cdn.shopify.com/s/files/1/0428/7424/1187/files/23175954497.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/graco_agitator.pdf
    • https://cdn.shopify.com/s/files/1/0427/9985/7823/files/xogelifovalebi.pdf
    • https://cdn.shopify.com/s/files/1/0430/9739/1261/files/gracefully_broken_chords.pdf
    • https://cdn.shopify.com/s/files/1/0432/2679/2093/files/bilejekimikebubolidoboliv.pdf
    • https://cdn.shopify.com/s/files/1/0431/1239/9010/files/rozitemuwasepetuwuseb.pdf
    • https://cdn.shopify.com/s/files/1/0437/5203/0357/files/53407998078.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1041/files/99315687783.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_off000065b6.bin
6ffd5f61c9f0121c6761b8e59777ca7eb02c280c23fb3ee0b30e529a797b8382
pdf-font-stream PDF embedded font (sfnt) at offset 0x65B6 5404 bytes
font_01_sfnt_off000077f3.bin
8bb177cbecae078d4e6d0195e0eb7c811aebefb9aaa51c7366a3d36b89b7e250
pdf-font-stream PDF embedded font (sfnt) at offset 0x77F3 9648 bytes