Malicious PDF — malware analysis report

Static analysis result for SHA-256 258817cfa4926334…

MALICIOUS

PDF

42.6 KB Created: 2020-08-25 13:29:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18b8d3de78e8b4e91bc9ac12392aae93 SHA-1: 1db71b87b221241e956ac080c50c9d7dfc4f8995 SHA-256: 258817cfa49263349e7672525c6e3cd0b2fe95c1170362e7d2d7cae9d4c2da8e
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting it is the primary lure. The presence of numerous other links, many pointing to Shopify domains, indicates a link farm strategy to obscure the malicious destination. 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.com/pify?keyword=balsamiq+mockups+free++for+windows
    • http://files.fromsandy.com/uploads/1/3/1/6/131607075/e117bcb9.pdf
    • http://files.maronianinsurance.com/uploads/1/3/2/6/132695832/defurer.pdf
    • http://jobezori.kidsplaycevt.org/uploads/1/3/1/4/131406390/riwozinap_wugisawuna.pdf
    • https://cdn.shopify.com/s/files/1/0428/3301/9047/files/jirijumamunazademupe.pdf
    • https://cdn.shopify.com/s/files/1/0431/7010/3452/files/94582405977.pdf
    • https://cdn.shopify.com/s/files/1/0448/1299/2672/files/bacteriology_mcq_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0440/1322/4094/files/84234686284.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/39544727905.pdf
    • https://cdn.shopify.com/s/files/1/0430/3339/5351/files/75953999534.pdf
    • https://cdn.shopify.com/s/files/1/0428/6591/8118/files/know_yourself_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0444/7030/4935/files/espn_nfl_2k5.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005cf9.bin
5b1a03d73e788f924563ff11444f6bc702860e5a73e328da392eace600cfa7e3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5CF9 5632 bytes
font_01_sfnt_off00007013.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
pdf-font-stream PDF embedded font (sfnt) at offset 0x7013 1800 bytes
font_02_sfnt_off000078a0.bin
d0fd9edf2ba60a33763b86968ea8571dd2d870b4853c01e55802456be86dd230
pdf-font-stream PDF embedded font (sfnt) at offset 0x78A0 11224 bytes