Malicious PDF — malware analysis report

Static analysis result for SHA-256 de71034c16a6b052…

MALICIOUS

PDF

50.9 KB Created: 2020-07-29 09:43:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fa4f760c193651cb471313d23fd2296 SHA-1: bece7b3924f4fd3227f3b64fa1ba5a56dd69028e SHA-256: de71034c16a6b05204526e38dd29e691f21226e7d1ed696df72183a956c310cf
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, many of which point to a redirector service (ttraff.ru) and appear to be part of a link farm designed for SEO manipulation. The document body, though heavily obfuscated, contains text related to search queries, reinforcing the lure. The ML classifier strongly indicated maliciousness, and the PDF structure itself was flagged for containing a malicious redirector link.

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=guided+by+voices+bee+thousand+full+album
    • http://files.amen4life.org/uploads/1/3/1/4/131437445/nusizodixodafutuzoze.pdf
    • http://files.movingmedicineali.com/uploads/1/3/0/8/130874658/jogiwitenim-lulopewixiduza.pdf
    • http://files.barrelworx.com/uploads/1/3/1/3/131398507/2e92538253.pdf
    • https://cdn.shopify.com/s/files/1/0431/2596/4957/files/65456110697.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2392/files/27856270528.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/67372082840.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1549/files/67342595842.pdf
    • https://cdn.shopify.com/s/files/1/0435/4228/2399/files/86050030417.pdf
    • https://cdn.shopify.com/s/files/1/0434/5266/1912/files/bamewopafobuwobujiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/3547/6636/files/2758488377.pdf
    • https://cdn.shopify.com/s/files/1/0428/5107/4214/files/94795466470.pdf
    • https://cdn.shopify.com/s/files/1/0429/5386/7427/files/11773157911.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/taniseraguvifololesugom.pdf
    • https://cdn.shopify.com/s/files/1/0437/6877/4814/files/53176220753.pdf
    • https://cdn.shopify.com/s/files/1/0429/8761/8463/files/nunuxulukuwaxusavuwusen.pdf
    • https://cdn.shopify.com/s/files/1/0428/2492/5351/files/6991806597.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_off000089b9.bin
1bd9f54d1fc9af7b51332e9798d1226108d67e91b31ec3deec4b1d944c4412d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x89B9 5380 bytes
font_01_sfnt_off00009bde.bin
e860a08c08f99ae9dd7eb851247b8a550379d6f509f29e73ccefe6dc91911ed2
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BDE 9960 bytes