Malicious PDF — malware analysis report

Static analysis result for SHA-256 2632dce5deda0c23…

MALICIOUS

PDF

33.0 KB Created: 2020-08-01 14:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a933c2b67468d1090a2239ccffad1c4 SHA-1: 7f2b789a22c30258cb5776886a7bb5b955eeb03b SHA-256: 2632dce5deda0c237bb1b72b6f387dc8c75327eabd1a532e3d799680d26a0c73
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL identified is https://ttraff.com/pify?keyword=reggaeton+music+downloads. The document body is heavily obfuscated but contains references to the malicious URL and other embedded links, suggesting a lure for users to click through to potentially malicious content. The ML classifier also strongly indicated maliciousness.

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=reggaeton+music+downloads
    • http://files.ysifilms.com/uploads/1/3/1/6/131636655/1897999.pdf
    • http://files.floorcareandinterior.com/uploads/1/3/0/7/130739806/zabedizaviwes.pdf
    • http://files.mainehypnotistsngh.com/uploads/1/3/2/7/132740700/fejiweje.pdf
    • http://files.maydaystudio.com/uploads/1/3/1/6/131637546/162127.pdf
    • https://cdn.shopify.com/s/files/1/0436/8482/3205/files/poxupetuf.pdf
    • https://cdn.shopify.com/s/files/1/0439/1976/9755/files/docker_enter_container.pdf
    • https://cdn.shopify.com/s/files/1/0433/8273/5006/files/besovisitoxixamubid.pdf
    • https://cdn.shopify.com/s/files/1/0434/6239/4008/files/34103762578.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/madadajufiwezufawowid.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zabaravoxetifup.pdf
    • https://cdn.shopify.com/s/files/1/0429/8155/6375/files/98813012362.pdf
    • https://cdn.shopify.com/s/files/1/0434/5308/7909/files/ridopetowovokulufazomi.pdf
    • https://cdn.shopify.com/s/files/1/0440/5913/2054/files/92455358741.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/89513037224.pdf
    • https://cdn.shopify.com/s/files/1/0430/8379/2533/files/50346280510.pdf
    • https://cdn.shopify.com/s/files/1/0431/4100/5480/files/bepubapuxuxo.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_off00004437.bin
9c9f9d348a987011f5f135178aeb0c461f58d5507caaf1724b5f3778e87e436d
pdf-font-stream PDF embedded font (sfnt) at offset 0x4437 5264 bytes
font_01_sfnt_off00005628.bin
753ace8d2c7688270b60faa490a2fcebbd8ee1a45e83922e7afde2dd734b79bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5628 9708 bytes