Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3cbc20d2404fd76…

MALICIOUS

PDF

42.8 KB Created: 2020-08-29 04:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f97701c602d649d9c451f88bc37cfee3 SHA-1: 3a2f0d6fa4b9d87a074b9d21db85a1e66da9c0ce SHA-256: a3cbc20d2404fd76c09f18ac865a3306736772fd5be7cbb5933ad49527fba16c
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.club/wix?keyword=we+cant+stop+mp3+download+miley'. This URL is likely used to redirect the user to a malicious site. The document also contains a large number of embedded links, many of which point to Shopify domains, suggesting a link farm or SEO poisoning tactic. The ML classifier also strongly flagged this PDF as malicious.

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.club/wix?keyword=we+cant+stop+mp3+download+miley
    • https://cdn.shopify.com/s/files/1/0432/8410/3332/files/59823843130.pdf
    • https://cdn.shopify.com/s/files/1/0432/0369/0660/files/kawasaki_bayou_300_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/0761/4882/files/gloom_stalker_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/2037263583.pdf
    • https://cdn.shopify.com/s/files/1/0432/2577/6288/files/how_to_iterate_through_a_hashmap.pdf
    • https://cdn.shopify.com/s/files/1/0434/9739/0244/files/bingo_video_maker_apkpure.pdf
    • https://cdn.shopify.com/s/files/1/0432/0319/9138/files/bank_clerk_english_book.pdf
    • https://cdn.shopify.com/s/files/1/0434/0183/8744/files/7607947038.pdf
    • https://cdn.shopify.com/s/files/1/0434/6219/7400/files/tazuwebunepesafujute.pdf
    • https://cdn.shopify.com/s/files/1/0435/2707/8042/files/puvitenekinigolosu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7780/3925/files/mazop.pdf
    • https://cdn.shopify.com/s/files/1/0430/8090/8951/files/34246690293.pdf
    • https://cdn.shopify.com/s/files/1/0433/3748/2405/files/blue_monk_alto_sax.pdf
    • https://cdn.shopify.com/s/files/1/0437/2961/7057/files/subkonjungtiva_bleeding_adalah.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_off00005b12.bin
c0269a5ca2c3760544fd4c101e4e4799aa72319240f1be5a9509d556beb483b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B12 5496 bytes
font_01_sfnt_off00006dce.bin
75d3f4ad0d7c956d844200fb487f7e92166f7d0a8d19ce90e2ca619e7b889bcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCE 18528 bytes