Malicious PDF — malware analysis report

Static analysis result for SHA-256 3698f2c8b8b18948…

MALICIOUS

PDF

41.3 KB Created: 2020-09-02 04:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0187f0a9d8e2057a14a4720bbced7ce0 SHA-1: 80e89d1e5a893dac20ee845bd8c7ed7c47e39557 SHA-256: 3698f2c8b8b189483a38ab2f280df42b8308d7de69a467c6e9fdbae43e084d06
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/wix?keyword=abacus+mathematics+pdf'. This URL is embedded within the document body, suggesting a social engineering attempt to trick the user into clicking it. The presence of a large number of external PDF links also indicates a link farm, a common tactic for SEO poisoning or distributing malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/wix?keyword=abacus+mathematics+pdf
    • https://static.usrfiles.com/ugd/b8c837_21bd74cef4f34baca15867e4814c5181.pdf
    • https://static.usrfiles.com/ugd/4f92c1_7e404223add54f4a82a9ead37ff68855.pdf
    • https://static.usrfiles.com/ugd/269bb8_eae868d67f8e47b6bd8788df1877c306.pdf
    • https://static.usrfiles.com/ugd/ace02d_927f9466de3546cb83451e768550c75d.pdf
    • https://static.usrfiles.com/ugd/735189_75a8b1f7c4f944cd809310b9f8075dd7.pdf
    • https://cdn.shopify.com/s/files/1/0440/5297/1685/files/dexividegir.pdf
    • https://cdn.shopify.com/s/files/1/0451/1835/7669/files/esl_teacher_cover_letter.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pifafesilepobusofamut.pdf
    • https://cdn.shopify.com/s/files/1/0434/3103/5032/files/81918889950.pdf
    • https://cdn.shopify.com/s/files/1/0435/9448/1823/files/25734332709.pdf
    • https://static.usrfiles.com/ugd/e4f6f0_0e5ebc570aae42d4b14a36894f88dd93.pdf
    • https://static.usrfiles.com/ugd/faa7ef_e87d9207ff1946b4a7f88c977168ca3f.pdf
    • https://cdn.shopify.com/s/files/1/0432/9740/7126/files/papex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54313135065.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_off00005ce0.bin
7dc258a45f21a549e9d9c7459bc35cae2a1c381c852994b404a2c754b72aa411		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CE0 5396 bytes
font_01_sfnt_off00006f15.bin
379dd7846582239ad59db37fe248ddfb627d2637c085c9e1861e6a7d896851c8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F15 13256 bytes

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