Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac8f5c343f1600ec…

MALICIOUS

PDF

43.7 KB Created: 2020-08-24 19:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cdc155bdeca265580fa11fdcc7fb0c0 SHA-1: 52cffc8219191532c6b5cd6ccc397fe22ccd46b4 SHA-256: ac8f5c343f1600ecffc34c2744dce8ce0a69d6c97f6207774f7c8614bf8892d4
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to lure users with the promise of car insurance quotes. This redirector then leads to a link farm hosted on Shopify, which in turn points to various PDF files hosted on suspicious domains. The ML classifier strongly indicates maliciousness, and the embedded URLs confirm a phishing or redirection attempt.

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=car+insurance+quotes+comparison+without+personal+information
    • http://moxisexev.mydesignpictures.com/uploads/1/3/2/6/132696414/597035.pdf
    • http://pevibir.northposeybasketball.com/uploads/1/3/0/9/130969140/0600f74.pdf
    • http://files.bavarian-opera-academy.com/uploads/1/3/1/4/131454207/lefejukunagu.pdf
    • http://files.ahwatukeecommunitycenter.com/uploads/1/3/0/7/130776646/81a0b.pdf
    • http://xokizi.westernwilcodemsclub.com/uploads/1/3/0/8/130814297/7657925.pdf
    • https://cdn.shopify.com/s/files/1/0432/1532/3291/files/37267964390.pdf
    • https://cdn.shopify.com/s/files/1/0430/8343/2096/files/wapikakot.pdf
    • https://cdn.shopify.com/s/files/1/0434/1514/2567/files/ordering_numbers_worksheets_for_grade_1.pdf
    • https://cdn.shopify.com/s/files/1/0438/0845/6865/files/10407189321.pdf
    • https://cdn.shopify.com/s/files/1/0441/1323/2024/files/sownik_angielski_chomikuj.pdf
    • https://cdn.shopify.com/s/files/1/0465/1673/2054/files/69650225358.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/sixagutunonu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3474/5760/files/bike_race_apkpure.pdf
    • https://cdn.shopify.com/s/files/1/0438/3349/1606/files/chromic_acid_msds.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_off00006acb.bin
dfb7c4d4934c02836c6cee631619da09aee6cb90a07418356ad20d5661522d8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ACB 5380 bytes
font_01_sfnt_off00007d07.bin
f166c5d873f1e46cbcd3020ef24ab6237552144fa3821bcfc25006f9a2b8dfc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D07 10624 bytes