Malicious PDF — malware analysis report

Static analysis result for SHA-256 d391d3b81cdddf5c…

MALICIOUS

PDF

59.9 KB Created: 2020-08-31 04:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10109f436061034d6b4b5f721dc86831 SHA-1: e439d5bfbd2bc24e6ec34355772171059329fc33 SHA-256: d391d3b81cdddf5c47a9a7c1c286615d21ddbcc6271ce14550ba2a2e6610b548
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a known malicious redirector (ttraff.cc). The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the same URL as the malicious redirector, suggesting the primary intent is to drive users to this malicious site. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, likely to obscure the malicious destination.

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=yuan+shao+guide+total+war
    • https://cdn.shopify.com/s/files/1/0428/4927/1975/files/18172222621.pdf
    • https://cdn.shopify.com/s/files/1/0433/6710/4668/files/fetufujivi.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/76002547277.pdf
    • https://cdn.shopify.com/s/files/1/0429/8178/5753/files/gudajut.pdf
    • https://cdn.shopify.com/s/files/1/0434/1805/8901/files/fibafepunuguweriveban.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/fikijejilofojon.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6896/files/vufuxonevutovada.pdf
    • https://cdn.shopify.com/s/files/1/0433/7152/8344/files/vakobafid.pdf
    • https://cdn.shopify.com/s/files/1/0428/7240/6179/files/supalosedipisiwoporegur.pdf
    • https://cdn.shopify.com/s/files/1/0431/3346/8821/files/alesis_dm5_manual_cz.pdf
    • https://static.usrfiles.com/ugd/db93e9_1c4640e218d44c848b0ce8b1aa4a93f8.pdf
    • https://static.usrfiles.com/ugd/5de1df_580e04f97fa848369b577e33dc9043bb.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_off0000ae76.bin
edade3b9eab441767b3c6ecf16ab6e63d2e8d5d7c24a7bffecbd796dcf93cf24
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE76 5140 bytes
font_01_sfnt_off0000bff7.bin
13e8d73fd95fab07d9825cbb3951e8a71de0047af0a0a4638327cdda5f656ba6
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF7 10196 bytes