Malicious PDF — malware analysis report

Static analysis result for SHA-256 834e8e1dbda4d27b…

MALICIOUS

PDF

35.9 KB Created: 2020-08-01 06:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ceaf4a9a27e265483be70e77e5bf59e SHA-1: 7b45946a1786671cc42c9e677e7f15edba78806b SHA-256: 834e8e1dbda4d27bce9a6e8e7ea1dce151578a39d68ffe697c0197b78b49dd20
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a known malicious redirector, ttraff.com, which is disguised as a vehicle manual. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL and keywords suggesting a lure. The presence of numerous Shopify links, some confirmed benign and others unknown, suggests a link farm or distribution network.

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=2012+jeep+liberty+manual
    • http://files.solomonsknotcollective.com/uploads/1/3/1/4/131482999/8328172.pdf
    • http://files.tracethemitten.com/uploads/1/3/1/1/131163943/5ab378ebe.pdf
    • http://files.rochonlab.ca/uploads/1/3/2/6/132695932/gedifiwekizu.pdf
    • https://cdn.shopify.com/s/files/1/0435/8370/1151/files/pesupogitalerivef.pdf
    • https://cdn.shopify.com/s/files/1/0432/5025/3979/files/dd_form_1351-_2.pdf
    • https://cdn.shopify.com/s/files/1/0431/7508/4193/files/60481606045.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44240048578.pdf
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/28193599362.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5126/files/67329082176.pdf
    • https://cdn.shopify.com/s/files/1/0430/4902/5690/files/bixos.pdf
    • https://cdn.shopify.com/s/files/1/0430/7789/4293/files/basozigidojewisupize.pdf
    • https://cdn.shopify.com/s/files/1/0432/3826/0899/files/mekavu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/19903609616.pdf
    • https://cdn.shopify.com/s/files/1/0438/4541/9173/files/simek.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/23493725146.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_off00004d3e.bin
525724a5252375b96e8b5f5d4323382ffc68ba20f158c61f8d8e59c22d49e390
pdf-font-stream PDF embedded font (sfnt) at offset 0x4D3E 5336 bytes
font_01_sfnt_off00005f59.bin
108b113f1b3344e55b35cfcd8bc1ee4f02510d9bbf712e24ceed7b5c79a5502a
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F59 10364 bytes