Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2957def73ade42…

MALICIOUS

PDF

40.8 KB Created: 2020-08-06 02:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f80e1fb165621fb7555063c179bd8d9 SHA-1: a761fa4e0d281ed352b8c39150a46dd01fc97725 SHA-256: ec2957def73ade4243633b728fe98c579cdf358f52a0194a76c86c456247179c
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.ru, which is designed to lure users to malicious content. The document body, though heavily obfuscated, contains the same URL and references a PDF download, suggesting a link farm or SEO poisoning attack. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting users to malicious infrastructure.

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=bhagavad+gita+chapter+17+english+pdf
    • http://files.picasso-moments-bakery.com/uploads/1/3/1/4/131453086/vigusideruketos.pdf
    • http://files.joyceeliasart.com/uploads/1/3/1/8/131856188/mesivulop-pepilajuza-vifipofuzemuxu-mazomobag.pdf
    • http://files.rileystack.com/uploads/1/3/0/7/130775916/8291662.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3277/files/nulimowekuledexiwituxonu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0486/2374/files/11806887011.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/44791735710.pdf
    • https://cdn.shopify.com/s/files/1/0430/8297/3346/files/74951333898.pdf
    • https://cdn.shopify.com/s/files/1/0430/7058/7029/files/tufizedafonik.pdf
    • https://cdn.shopify.com/s/files/1/0428/0451/0887/files/genetic_algorithm_matlab_code.pdf
    • https://cdn.shopify.com/s/files/1/0430/1943/6185/files/breathing_for_relaxation.pdf
    • https://cdn.shopify.com/s/files/1/0437/2476/7400/files/50498907334.pdf
    • https://cdn.shopify.com/s/files/1/0432/3393/5515/files/55715064362.pdf
    • https://cdn.shopify.com/s/files/1/0427/5693/1751/files/9.pdf
    • https://cdn.shopify.com/s/files/1/0432/7381/4182/files/12655235241.pdf
    • https://cdn.shopify.com/s/files/1/0431/4071/0562/files/kekimif.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_off000060b6.bin
e5b8e975e4d5279d35484f3bab4bd228378c5bae9f53d0ec1d0fd1987376e3ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x60B6 5656 bytes
font_01_sfnt_off0000740e.bin
64769216053004648677e99f6c84fd0ae63fd931df9cb5fff4bb7788e8edecfe
pdf-font-stream PDF embedded font (sfnt) at offset 0x740E 10088 bytes