Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a8c748a19a4a1f…

MALICIOUS

PDF

44.2 KB Created: 2020-09-01 03:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9cc321e85270a26798c93d3674d168c SHA-1: 1b1c81130e06d5ce9470d448602a45b042d83297 SHA-256: a4a8c748a19a4a1f85fa4c31d295ef3f4d51b67c39e12e3e103e2b95aab50032
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is designed to lead users to further malicious content. The document body, though heavily obfuscated, contains the same URL and a related keyword, suggesting a lure for potentially harmful content. The presence of a large number of external PDF links, many pointing to Shopify, further indicates a link farm or SEO manipulation tactic to distribute malicious content.

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/wix?keyword=top+free+music++sites+illegal
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/najuni.pdf
    • https://cdn.shopify.com/s/files/1/0440/5100/5590/files/dawojawarobodilepavaboz.pdf
    • https://cdn.shopify.com/s/files/1/0430/3123/2674/files/rejukubesivizitosezubep.pdf
    • https://cdn.shopify.com/s/files/1/0434/6655/5556/files/yes_boss_full_movie_free_hd.pdf
    • https://cdn.shopify.com/s/files/1/0431/2711/1841/files/82968696419.pdf
    • https://cdn.shopify.com/s/files/1/0431/1718/3130/files/probability_theory_and_random_processes_by_peebles.pdf
    • https://static.usrfiles.com/ugd/c8a981_bc4bdbd2d1ad4379a72b5abae64d31e5.pdf
    • https://static.usrfiles.com/ugd/f46427_051b8f3f75e5484d988ed26cfb9bc4b9.pdf
    • https://static.usrfiles.com/ugd/4c1554_6385a738b3b54ad49aad2160675a9e9c.pdf
    • https://static.usrfiles.com/ugd/0f5b72_a19524a79d7f4b5a888cc98fcfebb4a0.pdf
    • https://static.usrfiles.com/ugd/bf0735_5c1e70ea580f4643980d7fc78b7d7c6c.pdf
    • https://static.usrfiles.com/ugd/9b5f63_717f6c3762344cd0b2d5f0697b29d2cf.pdf
    • https://static.usrfiles.com/ugd/b8c837_28410656406e4946852adc44fe522506.pdf
    • https://static.usrfiles.com/ugd/1e32c2_57db6e8110054a6a9fd8306468867d75.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_off00006e81.bin
8cd9eaa18f98e39082340f55dc17c8022131139412a3ae6fe98cf1d4ef8f00ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E81 5284 bytes
font_01_sfnt_off0000806a.bin
38c4bc5cb522d61a30b935d467e7098a16d680674a3becdbeef3e4bb1b5329dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x806A 10336 bytes