Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d90c3c77c3be6f9…

MALICIOUS

PDF

41.1 KB Created: 2020-08-24 15:05:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14485203a103141885f65fe367b36215 SHA-1: f7efa22573ee2ee89b0ed638cf3e98e28c2d4afc SHA-256: 1d90c3c77c3be6f98de417828134585d901cd52f744543b6680e7f26d93e38cf
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm for SEO manipulation. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains text related to 'free piano sheet music' and the malicious URL, reinforcing the lure.

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=free+piano+sheet+music+for+white+christmas
    • http://files.adventbrevard.org/uploads/1/3/1/3/131381363/pobozexon_tisijewugipot.pdf
    • http://files.panteeny-fertilizers.com/uploads/1/3/1/8/131871871/423692.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0549/files/75475705162.pdf
    • https://cdn.shopify.com/s/files/1/0448/1007/6322/files/security_deposit_form_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/4402/0125/files/3556416815.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94393320092.pdf
    • https://cdn.shopify.com/s/files/1/0430/6750/6849/files/kipepulimanimabowu.pdf
    • https://cdn.shopify.com/s/files/1/0436/0755/6258/files/6863835545.pdf
    • https://cdn.shopify.com/s/files/1/0433/1687/1326/files/38813506881.pdf
    • https://cdn.shopify.com/s/files/1/0438/5246/4293/files/17613863667.pdf
    • https://cdn.shopify.com/s/files/1/0462/0658/2937/files/34595062677.pdf
    • https://cdn.shopify.com/s/files/1/0430/6472/1562/files/another_eden_1._5._500_mod_apk.pdf
    • https://cdn.shopify.com/s/files/1/0427/5086/9671/files/mamuxerurujopuremasinufos.pdf
    • https://cdn.shopify.com/s/files/1/0434/5665/9621/files/libro_caballo_de_troya_4.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_off000062ce.bin
397d760f89cd6374359c484512313a8de5663913ba81f17d300b300deae7d304
pdf-font-stream PDF embedded font (sfnt) at offset 0x62CE 5268 bytes
font_01_sfnt_off0000749f.bin
f410ff60b2d2bd4682a4296bc1b4f988863d7944807896e6e4bc17034f4c5c86
pdf-font-stream PDF embedded font (sfnt) at offset 0x749F 10192 bytes