Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f37bd2c1ea9abd8…

MALICIOUS

PDF

36.9 KB Created: 2020-08-24 14:11:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d676749eec8c15701f0ae9ac9984bfb SHA-1: fe2ec34de1bcaa27395a2d11cb697183b64452d8 SHA-256: 8f37bd2c1ea9abd860640e7e5a9d331a22b0c67720ec8151e54e6f89930d3b99
120 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised as a graphing worksheet. This indicates a phishing or malware delivery attempt. The document body, though heavily obfuscated, contains the same URL and references to 'wkhtmltopdf', suggesting it was generated programmatically to appear as a legitimate document. The presence of numerous other Shopify links, while mostly benign, contributes to a link farm tactic, potentially to improve SEO for malicious content.

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/pify?keyword=slope+intercept+form+graphing+worksheet+pdf
    • http://files.mitchellartschool.com/uploads/1/3/0/9/130969190/mezijolemusepi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7813/1611/files/7625780648.pdf
    • https://cdn.shopify.com/s/files/1/0433/0641/8331/files/biopsychology_pinel_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/3103/6053/files/79392559491.pdf
    • https://cdn.shopify.com/s/files/1/0433/9105/8083/files/flexible_sheet_metal_working.pdf
    • https://cdn.shopify.com/s/files/1/0436/1371/6643/files/56262996977.pdf
    • https://cdn.shopify.com/s/files/1/0441/0051/8040/files/20002802629.pdf
    • https://cdn.shopify.com/s/files/1/0438/5023/6054/files/tetiwelirigopu.pdf
    • https://cdn.shopify.com/s/files/1/0460/9182/9412/files/erin_brockovich_movie_questions_and_reflections_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/1141/4943/files/menixutijatafezi.pdf
    • https://cdn.shopify.com/s/files/1/0466/2512/8613/files/61017427713.pdf
    • https://cdn.shopify.com/s/files/1/0431/6640/0673/files/kisujevebuzupafu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1165/3277/files/resaxuju.pdf
    • https://cdn.shopify.com/s/files/1/0436/9691/4600/files/82264907732.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_off00005211.bin
806797bcb8d392f7de16e55ae15f92d82753e8b03634da1a4117b47c9d1f93ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5211 5828 bytes
font_01_sfnt_off000065c5.bin
fd5936db9cf83c19977f1560efeeabc864b2f7d907ad2e9bdeaf0c328a108ad9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C5 9732 bytes

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