Malicious PDF — malware analysis report

Static analysis result for SHA-256 a934fe2b73a9c12b…

MALICIOUS

PDF

40.0 KB Created: 2020-09-03 00:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5847ca2e4b3de580a11abf567697bf9 SHA-1: c639641f633a02abf098f39c1c0b0154658b08d0 SHA-256: a934fe2b73a9c12b173d6ec8fe6e16fcf238159d7dd7572d616fc85ca00e2590
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical redirector link to ttraff.ru, suggesting a link farm or phishing lure. The document body, though partially corrupted, indicates the content is presented as a worksheet, likely to deceive the user into clicking the malicious link. No scripts were extracted, but the PDF structure and embedded links strongly indicate a malicious intent to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=worksheet+on+integers+mixed+operations
    • https://cdn.shopify.com/s/files/1/0432/0516/5216/files/6894992481.pdf
    • https://cdn.shopify.com/s/files/1/0433/5353/8710/files/braid_pc_game_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0431/1662/6081/files/cds_1_2020_english_paper.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0666/files/quantitative_aptitude_questions_and_answers_free_download.pdf
    • https://static.usrfiles.com/ugd/b8c837_30a319ecbfb8443d8351d97a3c243ee1.pdf
    • https://static.usrfiles.com/ugd/b8c837_db5ce2301eab471998b6d72e6d83ad04.pdf
    • https://static.usrfiles.com/ugd/d63aaf_72458a37c0dd4682a3965a751821522d.pdf
    • https://static.usrfiles.com/ugd/a18aa6_4d64e29925dd48da9d999b4f221ee18c.pdf
    • https://static.usrfiles.com/ugd/a1fb72_83db9e819a044ba981ba8dbeb6f927b5.pdf
    • https://static.usrfiles.com/ugd/cec570_955e6fb69ff44c89901c3e6ab441475b.pdf
    • https://cdn.shopify.com/s/files/1/0432/8456/2086/files/88017948382.pdf
    • https://cdn.shopify.com/s/files/1/0430/6268/9946/files/99102418189.pdf
    • https://cdn.shopify.com/s/files/1/0434/1415/9521/files/fuxesomoferorub.pdf
    • https://cdn.shopify.com/s/files/1/0434/6085/3912/files/rexiwugavoragopupekiki.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_off00005d13.bin
a80d5fc606d25e34cf8637f7bdc317c33660c6d7b7bba6d9ec4aabb1e326d933		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D13 5488 bytes
font_01_sfnt_off00006f9e.bin
7586fd6a2e07d1de49d8cff911187a5d7cfdb6d918e7483a0ec19857ab1442ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F9E 10568 bytes

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