Malicious PDF — malware analysis report

Static analysis result for SHA-256 312c91b52000f589…

MALICIOUS

PDF

47.3 KB Created: 2020-07-31 22:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1538cf1b97d650814dd58f5d2d1fe09a SHA-1: c1ab17335f09de687f94163edc6f7263365e62eb SHA-256: 312c91b52000f589bbac43fa2405cf8da665cef131feda59f4a719ac874fe963
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier as malicious and contains a large number of external links. One of these links, 'https://ttraff.ru/pify?keyword=black+demons+catacombs', points to a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it is a primary lure. The presence of a link farm indicates an attempt to distribute malicious content widely.

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=black+demons+catacombs
    • http://files.sweetbabiesdayhome.com/uploads/1/3/2/7/132740320/zipud_wenuv_soraminudej.pdf
    • http://files.fitstudiolancaster.com/uploads/1/3/1/3/131379939/020a064.pdf
    • http://files.debistrong4peacehopelove.com/uploads/1/3/1/1/131163666/farivusijik_wiwofimud_petabatu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3669/5959/files/sutanowo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80463449019.pdf
    • https://cdn.shopify.com/s/files/1/0432/0978/5512/files/26419597873.pdf
    • https://cdn.shopify.com/s/files/1/0429/5717/6986/files/bisoxiselokagofose.pdf
    • https://cdn.shopify.com/s/files/1/0432/4343/8242/files/wagofuwi.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7922/files/43528047169.pdf
    • https://cdn.shopify.com/s/files/1/0432/9363/8811/files/9573631706.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7204/files/29178155895.pdf
    • https://cdn.shopify.com/s/files/1/0430/8742/9785/files/16030413904.pdf
    • https://cdn.shopify.com/s/files/1/0429/2539/2035/files/92230500868.pdf
    • https://cdn.shopify.com/s/files/1/0428/2017/3983/files/53641883895.pdf
    • https://cdn.shopify.com/s/files/1/0435/2560/3488/files/terrain_lod_redone.pdf
    • https://cdn.shopify.com/s/files/1/0430/3332/9817/files/71082726597.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_off0000752f.bin
0faf149bd3f02d3385f4aec3e965500c412e6c7f2f0ddb66bb92ea1e837580b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x752F 5244 bytes
font_01_sfnt_off000086f1.bin
b709308f41bc15a73fcae88e4ce72f2924e0463a2fbabe3edacb78c5573c487f
pdf-font-stream PDF embedded font (sfnt) at offset 0x86F1 13008 bytes