Malicious PDF — malware analysis report

Static analysis result for SHA-256 a45f164034c0838c…

MALICIOUS

PDF

44.0 KB Created: 2020-09-01 02:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25ee88121b3de84879b4cd42fbcfaadb SHA-1: c43680a5a5c6aeddc1987323a189b146ee2ce0c4 SHA-256: a45f164034c0838c28b1ae48afcffac356aacf34cc8ee17634a18f708fa27a92
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.cc/wix?keyword=diablo+1+hd+mod+belzebub', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other benign-looking PDF links, suggesting a lure to a malicious site. 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/wix?keyword=diablo+1+hd+mod+belzebub
    • https://cdn.shopify.com/s/files/1/0437/0359/9272/files/xakanejukizefivoj.pdf
    • https://cdn.shopify.com/s/files/1/0429/2971/7407/files/pupokifopeda.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7570/files/tenoxaburazowuxolodatab.pdf
    • https://cdn.shopify.com/s/files/1/0444/5034/9223/files/86753058969.pdf
    • https://cdn.shopify.com/s/files/1/0432/3937/5012/files/chambal_kannada_movie_songs.pdf
    • https://static.usrfiles.com/ugd/1813b3_f6f858ead10d4fc59c75853e7b1303c9.pdf
    • https://static.usrfiles.com/ugd/b8c837_a15e2bb99a464cf48c44de4e05ca7842.pdf
    • https://static.usrfiles.com/ugd/b8c837_8bc87731a82d48708873da3b9bc1b9ed.pdf
    • https://static.usrfiles.com/ugd/b8c837_02b643eed7824450bff7165a358eac70.pdf
    • https://static.usrfiles.com/ugd/f1d680_7217650e3aca45d18f092463f40537b2.pdf
    • https://cdn.shopify.com/s/files/1/0435/9910/2115/files/28284936487.pdf
    • https://cdn.shopify.com/s/files/1/0433/0081/4998/files/73445701715.pdf
    • https://cdn.shopify.com/s/files/1/0431/8294/8506/files/44815374196.pdf
    • https://cdn.shopify.com/s/files/1/0433/9692/3543/files/napuzajoxabup.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_off00006e7c.bin
43172c3cea7ba6f1fd9d67e53c1b647c274d5af050a77c1e9f014f44d6b2ba76
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7C 5032 bytes
font_01_sfnt_off00007f7e.bin
ae603ce9a2e557329b5bb075891417444aa54cb0ddb395a95b221e7afbd75993
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F7E 10508 bytes