Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a67e15ed3fc334d…

MALICIOUS

PDF

40.0 KB Created: 2020-08-09 23:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d651f28da4768d11908aaceeef44df7a SHA-1: f3a406587eaa408f789e41372fd42282a6f4895f SHA-256: 3a67e15ed3fc334d85e0af7f4af0342c8b174d0594eb56ef716a1ce915c5d52c
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with a critical heuristic firing indicating a link farm. One of these links, 'https://ttraff.ru/pify?keyword=non+probability+sampling+method+pdf', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs, reinforcing the link-based attack vector. No scripts were extracted, but the primary attack pattern is clear: luring users to malicious sites via embedded links.

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=non+probability+sampling+method+pdf
    • http://files.impactasylum.net/uploads/1/3/0/7/130775062/fd0c1.pdf
    • http://files.grapevinerealty.com/uploads/1/3/1/8/131860060/goroxebawivonaj.pdf
    • http://files.leapsforlives.org/uploads/1/3/1/4/131412181/325436.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/mazemuvedezidarositab.pdf
    • https://cdn.shopify.com/s/files/1/0434/3237/8517/files/software_testing_tools_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0441/2496/2968/files/84361089562.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kerikelamizefebimu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4048/9122/files/37653549771.pdf
    • https://cdn.shopify.com/s/files/1/0431/0925/3286/files/bezuxajuwowidagabun.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7917/files/xezijegifijibi.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8658/files/zizaxigiwoxow.pdf
    • https://cdn.shopify.com/s/files/1/0431/6227/1898/files/kutawafu.pdf
    • https://cdn.shopify.com/s/files/1/0439/8468/3166/files/20205664847.pdf
    • https://cdn.shopify.com/s/files/1/0437/2715/9448/files/essential_academic_skills.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rixozuxixewu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6359/files/54050676084.pdf
    • https://cdn.shopify.com/s/files/1/0427/9664/6556/files/37515261860.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_off0000608f.bin
09bb333dc36f935db703344a710630ac3833da6524ba421643945822a761e0ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x608F 5668 bytes
font_01_sfnt_off000073b0.bin
8823ca6b5f2b3991b7e8fa8716df25c53063dd1bdb5d6602597edea4e0e41ca4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B0 9240 bytes

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