Malicious PDF — malware analysis report

Static analysis result for SHA-256 43baeea552f1bf2e…

MALICIOUS

PDF

46.4 KB Created: 2020-08-22 16:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34b615acc8cf6bcb574044d0102dcdb2 SHA-1: 7d29363bb224fd089ab7d4e0a9e5af46e2bdb0b8 SHA-256: 43baeea552f1bf2e1ffe170df48b2d39c611f5f781fb690b0b703a0dd949da56
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, disguised as a 'wolf spider identification guide'. The ML classifier strongly flagged this PDF as malicious, and multiple heuristics indicate it's part of a link farm designed to distribute malicious content. The document body, though heavily obfuscated, contains the malicious URL and references to a guide, reinforcing the lure.

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.ru/pify?keyword=wolf+spider+identification+guide
    • http://files.reviverestorativeretreats.com/uploads/1/3/0/7/130775292/relawaparu-vurabovukef.pdf
    • http://files.strackband.org/uploads/1/3/1/4/131483249/2292786.pdf
    • http://files.susanmeehan.net/uploads/1/3/1/0/131070434/wimej.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/luneni.pdf
    • https://cdn.shopify.com/s/files/1/0437/2702/8375/files/lowrance_elite_4_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/1885/4306/files/gopiropogalujunadedara.pdf
    • https://cdn.shopify.com/s/files/1/0429/8375/1831/files/tabet.pdf
    • https://cdn.shopify.com/s/files/1/0428/7997/5590/files/9071557528.pdf
    • https://cdn.shopify.com/s/files/1/0433/2745/5400/files/zubigawawamaxojororomo.pdf
    • https://cdn.shopify.com/s/files/1/0462/8322/7296/files/codecombat_level_13_hack_and_dash_answer.pdf
    • https://cdn.shopify.com/s/files/1/0433/7883/5606/files/bovumafifafunozuzuwonuxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4066/9849/files/zisavejamagixigewis.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/61922653382.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_off000076c7.bin
1905fab1f227d2549a61397623bfa1a2bb232e664a994ab5953e97a0b2669fdc
pdf-font-stream PDF embedded font (sfnt) at offset 0x76C7 5336 bytes
font_01_sfnt_off0000890b.bin
dcebc144a0ea8660bccb267c0e0c3fe4bf9208d6ba72c0558657aed5dd709597
pdf-font-stream PDF embedded font (sfnt) at offset 0x890B 10416 bytes