Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ac7ef0af08e7eef…

MALICIOUS

PDF

42.6 KB Created: 2020-08-20 23:25:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8fd91e60815fbb14718beef34f61c2b1 SHA-1: 4802e13592376a3b047f8dc8e78f2cdf5080be87 SHA-256: 0ac7ef0af08e7eef4d47aa53259e692ca1508258ab11d4d489e1c638bfc16da2
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a malicious redirector. The heuristic firings indicate a PDF link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence point towards malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=pro+guide+draven
    • http://bevej.crowsmoon.com/uploads/1/3/2/6/132681464/sakaza.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/9819/3566/files/zelaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/3663/8369/files/17704755938.pdf
    • https://cdn.shopify.com/s/files/1/0430/5957/6986/files/information_security_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/3647/3501/files/vujas.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/rujerijawe.pdf
    • https://cdn.shopify.com/s/files/1/0437/5986/1909/files/free_birthday_gift_certificate_template.pdf
    • https://cdn.shopify.com/s/files/1/0428/8947/8307/files/xarobuner.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fe1.bin
3cf59cd033f827a0d39bc29a27a07cbf07ebc7b44799d3d50c440743b3d1f42b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE1 4844 bytes
font_01_sfnt_off0000706d.bin
db45f842582e358aa5bedffadeffa991b13f2a05dfb3660ce06e08e1c3530de9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x706D 14816 bytes

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