Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3d9636d85a0ffdf…

MALICIOUS

PDF

35.5 KB Created: 2020-08-21 17:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8aa8865160eabb66bc1f3fd77e4d8f3 SHA-1: 7a3ceb0668d5cbb0b8faed2030dd9f3b32f530b5 SHA-256: d3d9636d85a0ffdf5e74ac5cae6ada14a232973470fc37e12f85bac3c75c4e7f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one pointing to a known malicious redirector (ttraff.ru). The document body, though partially corrupted, includes text related to 'formal dresses' and the malicious URL, suggesting a lure. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves redirecting users to potentially harmful sites.

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=formal+dresses+aus+boutique
    • http://wipekukep.guntersvillelionsclub.com/uploads/1/3/0/7/130740013/9e2f2de1d66c.pdf
    • http://files.savannahghostwalks.com/uploads/1/3/1/3/131380480/7746184.pdf
    • http://xevuzim.18390621srn.com/uploads/1/3/1/8/131856190/bef44b818d9279.pdf
    • http://zurov.flowerdeb.com/uploads/1/3/1/8/131856166/didozepuj-bafabovorusiz.pdf
    • http://files.millantiques.com/uploads/1/3/1/4/131437477/8575998.pdf
    • https://cdn.shopify.com/s/files/1/0435/2281/8200/files/896438569.pdf
    • https://cdn.shopify.com/s/files/1/0433/5622/5686/files/ripovagix.pdf
    • https://cdn.shopify.com/s/files/1/0438/4640/2208/files/speaking_criteria.pdf
    • https://cdn.shopify.com/s/files/1/0431/5545/6164/files/55050844090.pdf
    • https://cdn.shopify.com/s/files/1/0439/0731/7912/files/andhra_jyothi_epaper_telangana_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/6706/4998/files/98116497233.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4408/files/retegaraxuzelusoxogojepas.pdf
    • https://cdn.shopify.com/s/files/1/0433/4167/6694/files/vibujamaxogimigupini.pdf
    • https://cdn.shopify.com/s/files/1/0430/6062/5562/files/free_icons_for_windows_8.pdf
    • https://cdn.shopify.com/s/files/1/0431/5506/2938/files/32521431925.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_off00004e0b.bin
acf2f42f2809085334c1753982de3fce2e83792ed5290d7f61ee49bcdb6e40cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x4E0B 5192 bytes
font_01_sfnt_off00005f8c.bin
2d0cee91a5ed96c36f4992afac06e392c1793e861450db3e00fe9c96f8b8b64b
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F8C 10000 bytes