Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a76d44a7e598f83…

MALICIOUS

PDF

47.8 KB Created: 2020-08-25 22:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f95352899b91040d0bdf4f7d4e981f4f SHA-1: 76fabd749776d03ff73b6dc5a98b87297507c57e SHA-256: 8a76d44a7e598f83fcad11d4833c34f49ba51e98557eb63bed0b46e780c5859f
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1204.002 Malicious File: Malicious Link

The PDF file contains a large number of embedded links, many pointing to PDF documents hosted on shopify.com, which is indicative of a link farm. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which further suggests malicious intent. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text but includes the malicious redirector URL.

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.cc/pify?keyword=victorinox+swiss+army+cavalry+watch
    • http://files.abdesignsshowclothing.com/uploads/1/3/1/6/131606343/d1d922f7a.pdf
    • https://cdn.shopify.com/s/files/1/0447/9270/9271/files/big_5_personality_test_questions.pdf
    • https://cdn.shopify.com/s/files/1/0431/1079/3370/files/reluzetipigetamot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52325197595.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/godobojapun.pdf
    • https://cdn.shopify.com/s/files/1/0430/4162/0119/files/emotional_status_marathi_video.pdf
    • https://cdn.shopify.com/s/files/1/0434/8674/0646/files/rawobexefoxurulema.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8949/files/14813742736.pdf
    • https://cdn.shopify.com/s/files/1/0433/4249/5895/files/badelotelenibiri.pdf
    • https://cdn.shopify.com/s/files/1/0427/8861/8396/files/18324700454.pdf
    • https://cdn.shopify.com/s/files/1/0431/7977/0019/files/boxuk.pdf
    • https://cdn.shopify.com/s/files/1/0465/1198/0702/files/kupopimofoze.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_off00007b28.bin
baa4aa09eef105f77d215f4f23557dee4c43c90e5152622e8837bcc7d6d0f446
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B28 5324 bytes
font_01_sfnt_off00008d2d.bin
a99164bc9564ef32562efb0438db88bf9a7fe43b6b75b8cb4847142d62512a11
pdf-font-stream PDF embedded font (sfnt) at offset 0x8D2D 10428 bytes