Malicious PDF — malware analysis report

Static analysis result for SHA-256 49d53ab3f8380d0c…

MALICIOUS

PDF

41.5 KB Created: 2020-08-26 19:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4aa3fb12c0112c0bdce41dff1862e8a SHA-1: b4c1d19330942ceecc0d988734c967865504a327 SHA-256: 49d53ab3f8380d0c4d7750531ee701005e6f98a3da51026a233f2168c0e3907c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'Callisto slayer guide osrs', suggesting a social engineering pretext. The presence of numerous external links, many hosted on Shopify, further indicates a link farm or redirection strategy. The primary malicious IOC is the redirector URL, which likely leads to a phishing page or malware download.

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=callisto+slayer+guide+osrs
    • http://files.wiltshirehockey.co.uk/uploads/1/3/1/4/131407227/pitazikifupagerep.pdf
    • http://xakide.simpsonchorus.com/uploads/1/3/2/6/132696067/2978f697de79.pdf
    • https://cdn.shopify.com/s/files/1/0465/1240/6686/files/18394411223.pdf
    • https://cdn.shopify.com/s/files/1/0434/2143/4005/files/76644187262.pdf
    • https://cdn.shopify.com/s/files/1/0436/1905/7826/files/21160823140.pdf
    • https://cdn.shopify.com/s/files/1/0440/1135/6318/files/21314037612.pdf
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/53513310079.pdf
    • https://cdn.shopify.com/s/files/1/0434/6406/5188/files/jarilexonivi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8525/9159/files/91834798530.pdf
    • https://cdn.shopify.com/s/files/1/0431/0522/2818/files/81601871431.pdf
    • https://cdn.shopify.com/s/files/1/0440/9065/4885/files/luzimozugasomotefixanonik.pdf
    • https://cdn.shopify.com/s/files/1/0437/3384/4119/files/39886538487.pdf
    • https://cdn.shopify.com/s/files/1/0429/9030/5443/files/pijinowepeb.pdf
    • https://cdn.shopify.com/s/files/1/0430/5341/6601/files/disaster_report_4_ps4.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_off000064c7.bin
e41045da203903cd6e75e37560c39ca24171bcc2ecaf1e925c3deac1700f5f72
pdf-font-stream PDF embedded font (sfnt) at offset 0x64C7 5000 bytes
font_01_sfnt_off000075da.bin
2060a7be2e1686bf44a9ca71ffe0c3e39b4081c021212e5d33d27ef35cfad6af
pdf-font-stream PDF embedded font (sfnt) at offset 0x75DA 10376 bytes