Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac734c0b494b7a97…

MALICIOUS

PDF

43.9 KB Created: 2020-08-24 21:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4104ec7735eaa90e589934394e8ebaf SHA-1: 1def363db10b5798b1712a5e253ed1921d9b7f33 SHA-256: ac734c0b494b7a97187410b003ba705e3bfc51cb5bfc069163aad8a81c79f1d7
154 Risk Score

Malware Insights

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

The PDF contains a link farm, with one primary link pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=blank+t+shirt+design+templates', suggesting a lure to download or view design templates which redirects to malicious infrastructure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous embedded URLs, many pointing to Shopify, further supports a link-farming or redirection-based attack pattern.

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=blank+t+shirt+design+templates
    • http://files.signifytalismans.com/uploads/1/3/2/3/132302871/1445957.pdf
    • http://zorefa.benjamindbrown.com/uploads/1/3/2/8/132814930/ce246324.pdf
    • http://files.littlepinkhousesproduce.com/uploads/1/3/1/1/131164046/bidid.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45035229099.pdf
    • https://cdn.shopify.com/s/files/1/0440/0198/4662/files/sijudinedufexikufi.pdf
    • https://cdn.shopify.com/s/files/1/0440/7597/4821/files/58441018257.pdf
    • https://cdn.shopify.com/s/files/1/0431/2036/1629/files/discord_mass_delete_messages.pdf
    • https://cdn.shopify.com/s/files/1/0429/4973/8650/files/bs._to_app_apk.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65529241957.pdf
    • https://cdn.shopify.com/s/files/1/0432/6762/1028/files/95057222875.pdf
    • https://cdn.shopify.com/s/files/1/0445/4989/8399/files/holt_algebra_2_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1641/files/45778331188.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/fogixuxugumuxuxekusekan.pdf
    • https://cdn.shopify.com/s/files/1/0436/0214/9539/files/nidukozunopulakofuv.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_off000060de.bin
20411b5655efa37ee61889ec14aac6ca2a3ac6b513fbd5b8fca7dd3d17c47832		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60DE 5164 bytes
font_01_sfnt_off00007233.bin
c0a252ee8999da45e62370734f5588dbe6328bef6c6aa6ab02fd98ec151c3991		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7233 10204 bytes
font_02_sfnt_off000094e8.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94E8 4324 bytes

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