Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d382c612fbfac6…

MALICIOUS

PDF

38.3 KB Created: 2020-08-24 16:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbea53c42d58d33052a58f5a27c197c9 SHA-1: 7b60db5c6c2f1526797cb55d8de6ffda38fa9453 SHA-256: 99d382c612fbfac61be8d7649d0cd881e5d3a969ea56f6f567d3e663984b408e
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=perforated+metal+sheet'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many hosted on Shopify. The document body contains garbled text and the keyword 'perforated metal sheet', suggesting a lure for search engine optimization or spam. No scripts were extracted, and the primary malicious activity appears to be the redirection to a malicious site.

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=perforated+metal+sheet
    • http://lozinusov.digigoldies.com/uploads/1/3/0/8/130873851/diwibegulu.pdf
    • http://files.djnancyw.com/uploads/1/3/1/3/131398366/bumevewadelobuf.pdf
    • https://cdn.shopify.com/s/files/1/0431/3110/9540/files/70481321947.pdf
    • https://cdn.shopify.com/s/files/1/0432/4114/4483/files/dajuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jaled.pdf
    • https://cdn.shopify.com/s/files/1/0431/8383/3249/files/bio_data_form_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8455/4135/files/bisapemekovax.pdf
    • https://cdn.shopify.com/s/files/1/0439/3595/7147/files/89720008048.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20745245188.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9786/files/libro_aura_por.pdf
    • https://cdn.shopify.com/s/files/1/0437/0700/7127/files/39381279884.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_off00005861.bin
dc29af4e4f411296b563bf3f9a1298cf8acf4a6e74ac42bbdc222e1e1ce7962b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5861 5148 bytes
font_01_sfnt_off000069b4.bin
05804b35edb834977c222c39fb90e98a786c867b5e007e7373ac6f2184e4facd
pdf-font-stream PDF embedded font (sfnt) at offset 0x69B4 10296 bytes