Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0334c39aae8518a…

MALICIOUS

PDF

39.3 KB Created: 2020-08-20 18:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2970f22e766cf8105d63052dded0f759 SHA-1: ceac239ff632f46cbf933b9cca204e95e4281eca SHA-256: a0334c39aae8518aa93344a117349122096d57bdbfeb452a3e1f8ca8688928c1
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.com/pify?keyword=blewbury+school+uniform', is identified as a malicious redirector. The ML classifier strongly indicates maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to disguise the malicious intent.

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=blewbury+school+uniform
    • http://magazo.jvcai.org/uploads/1/3/1/4/131438500/f948f638.pdf
    • http://files.myphotographybyjess.com/uploads/1/3/1/4/131483201/629670b6d82f.pdf
    • http://files.mfmetalarts.com/uploads/1/3/0/7/130775655/8852782.pdf
    • http://files.provopressurewashing.com/uploads/1/3/0/9/130969686/40e408026.pdf
    • http://tuvarav.kimseiterdogagility.com/uploads/1/3/0/7/130775162/xokebake_fukekoru.pdf
    • https://cdn.shopify.com/s/files/1/0437/7201/8845/files/demurikasujizode.pdf
    • https://cdn.shopify.com/s/files/1/0428/1673/3340/files/noletepapagazimoki.pdf
    • https://cdn.shopify.com/s/files/1/0436/4887/6697/files/coolief_knee.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/76776548277.pdf
    • https://cdn.shopify.com/s/files/1/0433/6756/3420/files/adrenal_insufficiency_pathophysiology.pdf
    • https://cdn.shopify.com/s/files/1/0438/6881/5528/files/27001404410.pdf
    • https://cdn.shopify.com/s/files/1/0436/0667/1517/files/ratixaxobesawagos.pdf
    • https://cdn.shopify.com/s/files/1/0429/8443/9971/files/18491450952.pdf
    • https://cdn.shopify.com/s/files/1/0435/6620/3029/files/p90x_lean_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0840/files/62606122730.pdf
    • https://cdn.shopify.com/s/files/1/0431/0056/9766/files/piwafotevi.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_off00005ca1.bin
2969964ce638cc46ee27a94fd94f72d0cfe5befc3b73bc12ef9742db5f929bd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA1 5296 bytes
font_01_sfnt_off00006e90.bin
717e66b6cfaa2b302da505cde4d9492934bc624f42c4690fc701d8d9f59de3a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E90 9956 bytes