Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a6645afc08a202…

MALICIOUS

PDF

34.5 KB Created: 2020-08-03 01:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ab8ba1f31d1fc20aa9442c216abcc1f SHA-1: d5b7f48c149d15b7a3ad51d267632d40f513cf13 SHA-256: 22a6645afc08a2023a8341cf4db9879eaf4b171e223d19a0b3944473d78c5319
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-Override T1059.001 PowerShell

The PDF contains a link farm designed to appear as legitimate repair manuals, but the primary link redirects to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body text, though heavily obfuscated, contains the lure text and the malicious URL. The presence of numerous links to Shopify-hosted PDFs suggests a tactic to leverage seemingly benign content for SEO poisoning and traffic redirection.

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.com/pify?keyword=chevy+cavalier+repair+manual+pdf
    • http://files.quailridgehorseshoes.com/uploads/1/3/1/4/131483153/5213725.pdf
    • http://files.kerryswing.com/uploads/1/3/0/8/130874231/6266402.pdf
    • http://files.frameglaze.net/uploads/1/3/1/3/131379554/wudekebakaruliv.pdf
    • https://cdn.shopify.com/s/files/1/0430/2585/8711/files/58460306605.pdf
    • https://cdn.shopify.com/s/files/1/0434/6835/7796/files/dnd_5e_charm_person.pdf
    • https://cdn.shopify.com/s/files/1/0433/0081/4998/files/25717065099.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/ffmpeg_mp3_to_wav.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/xoxetumazizijizugot.pdf
    • https://cdn.shopify.com/s/files/1/0428/3082/3583/files/vijobenokofowe.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/gaxato.pdf
    • https://cdn.shopify.com/s/files/1/0430/8484/1124/files/tuzibakituwoxutivu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5928/1048/files/pubadawiduvud.pdf
    • https://cdn.shopify.com/s/files/1/0429/7100/5082/files/33837680259.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/77279429242.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/32715715486.pdf
    • https://cdn.shopify.com/s/files/1/0431/1177/6416/files/suwekibesuze.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_off000049f9.bin
cf701442c2805ad576cff3a519d08eb0e1609e156fb52610c6af3878323f5bc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49F9 5284 bytes
font_01_sfnt_off00005bd2.bin
6ee1d002634bdccb3cfdad6c720349c196e03e2132171b1436c49ee37db34f6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BD2 9732 bytes

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