Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7227b88dc9d6e3…

MALICIOUS

PDF

46.4 KB Created: 2020-07-31 05:10:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ff5503338f8eeb9296890aaa7c0852a SHA-1: b3f560f58d0e2ac5b39eceed405095278e8743ec SHA-256: df7227b88dc9d6e387ecfa5195b95db55e8d7e640dcb9852c42fe169f8c4975f
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits a PDF link farm heuristic, with numerous links pointing to Shopify domains, likely to obscure the malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, preventing analysis of its specific content, but the presence of a malicious redirector is sufficient to infer a phishing or malware distribution 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.com/pify?keyword=lab+equipment+pdf
    • http://files.chrishanxoxo.com/uploads/1/3/1/6/131607712/0b3bda.pdf
    • http://files.yourbodyyourbirthdoulaservices.com/uploads/1/3/1/3/131380786/maxaliguluzo-nuredigum-widexudijesusas.pdf
    • http://files.sjjww.org/uploads/1/3/1/8/131856723/roxegojutizavi_jikoragolozo_bafemupavixaj_tafapadimavav.pdf
    • http://files.all4ucustomcreations.com/uploads/1/3/0/7/130775677/minezetibuler.pdf
    • http://files.sambaedmonton.ca/uploads/1/3/0/7/130738943/pujixejoj.pdf
    • http://files.sjjww.org/uploads/1/3/1/8/131856723/roxegojutizavi_jikoragolozo_bafemup
    • https://cdn.shopify.com/s/files/1/0430/5226/9717/files/masolonanaxirigaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/7606/6207/files/mivazozividanewifetagomo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/3183641906.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6066/files/81792015347.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/74832969368.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kexikebesadunav.pdf
    • https://cdn.shopify.com/s/files/1/0428/8741/3923/files/47508013549.pdf
    • https://cdn.shopify.com/s/files/1/0430/9159/1317/files/nulajaweretesobidetege.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/429855865.pdf
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/64902491146.pdf
    • https://cdn.shopify.com/s/files/1/0430/8120/3873/files/55002630438.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_off000078b2.bin
52fa76f4e88bcf6235f1f19a4ecf8b00bcf85f8d58f02239a5a654cb7c64070a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78B2 4860 bytes
font_01_sfnt_off00008918.bin
5f8c122feeec9d5d8d289037d592b95f6966127dc693d4069d1f89c3779537e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8918 10612 bytes

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