Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bdfa014cf9a410…

MALICIOUS

PDF

45.7 KB Created: 2020-08-01 13:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16440c154e91872314b125940a7919da SHA-1: 5b61e7fe5f45c327995b8b3821b15a126d661d06 SHA-256: b8bdfa014cf9a410c973d2151f4a584c1e08c0243d2423dcd84b82ab20f53c23
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the target URL 'https://ttraff.cc/pify?keyword=after+effects+shortcuts', suggesting a lure to a malicious site. The presence of numerous PDF links, many hosted on shopify.com, indicates an attempt to disguise malicious activity within a large collection of seemingly benign content. The ML classifier also strongly flagged this PDF as malicious.

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/pify?keyword=after+effects+shortcuts
    • http://files.avispharmacyltd.com/uploads/1/3/1/4/131407952/sabiv.pdf
    • http://files.kristinlukanec.com/uploads/1/3/2/3/132303245/938586.pdf
    • http://files.hollotutor.com/uploads/1/3/1/4/131452817/3895686.pdf
    • http://files.faubionmiddleschool.com/uploads/1/3/1/1/131163705/bebifateb.pdf
    • https://cdn.shopify.com/s/files/1/0433/2240/9125/files/76854592157.pdf
    • https://cdn.shopify.com/s/files/1/0429/0809/0535/files/98348155015.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/6819160869.pdf
    • https://cdn.shopify.com/s/files/1/0436/3531/0752/files/stealthy_feat_5e.pdf
    • https://cdn.shopify.com/s/files/1/0429/2060/7900/files/kenojigo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6805/3909/files/17309814830.pdf
    • https://cdn.shopify.com/s/files/1/0435/1731/3176/files/nifopuzesukofumiguriwafa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51106899687.pdf
    • https://cdn.shopify.com/s/files/1/0429/7093/9541/files/mowilaneg.pdf
    • https://cdn.shopify.com/s/files/1/0438/4099/5490/files/53957232936.pdf
    • https://cdn.shopify.com/s/files/1/0435/3871/0696/files/95961914670.pdf
    • https://cdn.shopify.com/s/files/1/0435/8130/9085/files/turojaduxuxa.pdf
    • https://cdn.shopify.com/s/files/1/0430/3493/5447/files/21185691808.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000695d.bin
6e939c1e4463ca310d81907fec99d3f869e422a7d9b3232f54d924fb3c27620b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x695D 4444 bytes
font_01_sfnt_off00007891.bin
1fe1bc906bb654ade049e448eb6b936d2c7631b0c33086511ca10be62f44046b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7891 10432 bytes
font_02_sfnt_off00009b6f.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B6F 4324 bytes

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