Malicious PDF — malware analysis report

Static analysis result for SHA-256 66574d43fdd71039…

MALICIOUS

PDF

58.4 KB Created: 2020-08-04 04:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b16235f855020010ccdd0193b82972a0 SHA-1: e5cecd316cd7955ffd71d474da339493562b7a18 SHA-256: 66574d43fdd710397141593e69bbae95954cfc5d10bccc82a6c2f2275b1a0ad6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to trick users into visiting it. The presence of numerous other PDF links, many hosted on Shopify, indicates a link farm strategy to obscure the malicious destination. No scripts were extracted, but the primary attack vector appears to be a social engineering lure leading to a malicious URL.

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.ru/pify?keyword=free+printable+binder+covers+pdf
    • http://files.megacandyimporters.com/uploads/1/3/1/4/131454459/jujulerupubaze.pdf
    • http://files.isbhu.com/uploads/1/3/2/6/132681891/siduwekemudonijokuvu.pdf
    • http://files.markcreative.ca/uploads/1/3/1/8/131871744/7cf6c7fd8d2bc.pdf
    • http://files.btaccountingandtax.com/uploads/1/3/1/4/131437670/8a32a3c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3287/7976/files/60063250461.pdf
    • https://cdn.shopify.com/s/files/1/0431/1253/0081/files/97722101315.pdf
    • https://cdn.shopify.com/s/files/1/0431/4156/2522/files/holt_environmental_science_online_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/3782/6973/files/mejinawisukikimiwuki.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/gusewebuxojedub.pdf
    • https://cdn.shopify.com/s/files/1/0434/8782/1981/files/zinubeg.pdf
    • https://cdn.shopify.com/s/files/1/0432/8495/5300/files/15057088227.pdf
    • https://cdn.shopify.com/s/files/1/0428/6542/6598/files/buxanumesopuvewuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/6495/8879/files/61997099935.pdf
    • https://cdn.shopify.com/s/files/1/0436/1689/5133/files/14046153361.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008fb7.bin
451c9ec4f29d70613300d5a72970783853033b42e782c947ad798785302483cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FB7 5304 bytes
font_01_sfnt_off0000a1d0.bin
4f2744065a439171c65230ee2b915e4ecfb740d2ff994fd94e6b68eee5233e5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1D0 11000 bytes
font_02_sfnt_off0000c77b.bin
ccf42771811f3bfcfc4881e0ea26c61020463520b77f542a172ed5d532e4d210		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC77B 16088 bytes

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