Malicious PDF — malware analysis report

Static analysis result for SHA-256 395e2391885a83f2…

MALICIOUS

PDF

41.7 KB Created: 2020-08-16 18:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edd185bbddec48c88f525e0fa9024d42 SHA-1: 33de3a4ea5b60a0345883ef88865f8c964ac7dca SHA-256: 395e2391885a83f2a718a987bfb7c1e8799d6fa953410d95fe432021d716f2a9
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as a legitimate download for "Bitlocker to go reader windows 7". This link redirects to malicious infrastructure at ttraff.ru. The ML classifier strongly indicates maliciousness, and the PDF structure with numerous embedded links supports a social engineering attack pattern. No scripts were extracted, but the primary malicious action is the redirection via the embedded 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=bitlocker+to+go+reader+windows+7
    • http://files.adajunmakeup.com/uploads/1/3/1/6/131607053/8881454.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pinabazebovo.pdf
    • https://cdn.shopify.com/s/files/1/0436/6965/1606/files/71532220368.pdf
    • https://cdn.shopify.com/s/files/1/0432/6978/3720/files/94374634546.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lejozusuxawunulimedobina.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6111/files/84691267266.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wixet.pdf
    • https://cdn.shopify.com/s/files/1/0433/5465/2822/files/vector_product_example.pdf
    • https://cdn.shopify.com/s/files/1/0438/3657/1808/files/piligugaxeroxama.pdf
    • https://cdn.shopify.com/s/files/1/0431/3091/2934/files/dapur.pdf
    • https://cdn.shopify.com/s/files/1/0431/8747/0494/files/zagiwup.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_off00006112.bin
ab7568e1c693acb95e4b549f1156c9975f68ff68da860fac125ed3957f869ab7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6112 5392 bytes
font_01_sfnt_off0000738b.bin
9254ce6bab0d529f1441d1ab63c6a52a70e6b1f84becd41bb9e17fb72186559b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x738B 12716 bytes

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