Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a26dcc31104594…

MALICIOUS

PDF

41.3 KB Created: 2020-09-07 16:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b4e4c0f64974fb43f34035a2e61abec SHA-1: f4d193c8b1ef832898bfd5131528375d5a2eb5ca SHA-256: f7a26dcc311045944b30a732b218ce9b44ac8d40ce9bb71148fdd0f347af3074
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.club/wix?keyword=happy+birthday+cake+full+hd+images`. The document body, though heavily obfuscated, contains this same URL, suggesting a lure to a malicious site. The PDF also contains a large number of external links, many hosted on `cdn.shopify.com`, which is flagged as a link farm. No scripts were extracted from this sample.

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.club/wix?keyword=happy+birthday+cake+full+hd+images
    • https://cdn.shopify.com/s/files/1/0431/7318/3643/files/zugobeladeken.pdf
    • https://cdn.shopify.com/s/files/1/0434/1488/0405/files/pibunokebidosizake.pdf
    • https://cdn.shopify.com/s/files/1/0430/0472/3349/files/barron_s_sat_biology_free.pdf
    • https://cdn.shopify.com/s/files/1/0440/3019/7910/files/acceleration_problems_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/2393/2311/files/vevobeve.pdf
    • https://cdn.shopify.com/s/files/1/0440/5025/1941/files/solving_linear_equations_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0447/6397/1733/files/22829748238.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/nexuzatatugufijebetozu.pdf
    • https://cdn.shopify.com/s/files/1/0435/3998/8648/files/guxafitedadezokomu.pdf
    • https://cdn.shopify.com/s/files/1/0440/7299/2918/files/9152711182.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2093/files/xotepiwixisovebokix.pdf
    • https://cdn.shopify.com/s/files/1/0437/5258/7415/files/57419539422.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/63209554714.pdf
    • https://cdn.shopify.com/s/files/1/0461/9455/7077/files/numbers_in_english_1-_20.pdf
    • https://cdn.shopify.com/s/files/1/0432/7351/9269/files/palugilalilidunufuzote.pdf
    • https://cdn.shopify.com/s/files/1/0430/0881/9349/files/runijedetofekupiba.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_off00006218.bin
79cff1c50c296e0d2babe0ab90b5ec1a8c87ff0de008265fafa8ce079ff291e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6218 5836 bytes
font_01_sfnt_off000075ca.bin
000f701d6b979cf7ebf229755bbf1319faa45ef5a1208ec681874373c4a28c1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x75CA 10060 bytes