Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffe41ca144b4f933…

MALICIOUS

PDF

35.2 KB Created: 2020-08-31 07:23:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 390e89cfb29357f194571a4fa4df94b4 SHA-1: 91807fb749e5b3a2275a407f60cea3b3c5230ce4 SHA-256: ffe41ca144b4f9331732b35307a1db79af11c3d9ca356038062fb06f34544b75
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, disguised with a keyword related to 'riteway crack repair system'. This suggests a phishing or scam attempt. The document also contains a large number of external links, many pointing to static.usrfiles.com, which is flagged as a link farm. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive 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.cc/wix?keyword=riteway+crack+repair+system
    • https://static.usrfiles.com/ugd/2c608b_d4f949fae34945bd9b68e958e6adabc4.pdf
    • https://static.usrfiles.com/ugd/409ca8_4f7f067cdf6f473b897de65789cdc349.pdf
    • https://static.usrfiles.com/ugd/b8c837_2cc335b926d94dda95873f10afd7f546.pdf
    • https://static.usrfiles.com/ugd/5a1791_51e7ba60501d462eafcad4cf576f7689.pdf
    • https://static.usrfiles.com/ugd/c8a981_7efd1b3915534d3d92a4e463ef2cb96d.pdf
    • https://static.usrfiles.com/ugd/6f9b04_69473bcb72364d5882d79bf5b4cdfe50.pdf
    • https://static.usrfiles.com/ugd/b8c837_1222179c8d6948a5a40eb6c91c9f5962.pdf
    • https://static.usrfiles.com/ugd/16a96a_1214aa6b893c4af4aaf2d5cba7d126e6.pdf
    • https://static.usrfiles.com/ugd/6c032c_bf05ca6716034b7b9e91692042f5a332.pdf
    • https://static.usrfiles.com/ugd/6a22cb_b25345f5a2434f87a0a9b01c4fc0950b.pdf
    • https://cdn.shopify.com/s/files/1/0436/8374/1849/files/masigaxisu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6356/5718/files/65219430525.pdf
    • https://cdn.shopify.com/s/files/1/0434/4892/6364/files/65802410456.pdf
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/tegegil.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_off00004c3b.bin
688d5b174ab72fb095df7dea82e4f2d61466ba0aa9f841ff00ead19487e611a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x4C3B 5312 bytes
font_01_sfnt_off00005e4f.bin
135a0407380553a1a58b2719a8641101be1d9bdb7d0eed301279fc9876e8179c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E4F 9988 bytes