Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5ec311c30fd84f…

MALICIOUS

PDF

44.4 KB Created: 2020-08-05 05:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9cfc09a3350aa5cdd26424fae79eee96 SHA-1: 56b0ae534ef545b1401ff6aaa7ed18ebefbeecaa SHA-256: da5ec311c30fd84fd28e0646af765fe397fb0344dc070e927ac42fb0059cb736
150 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a critical heuristic firing for a malicious redirector link. The document body, though partially corrupted, contains text related to 'equivalent fractions worksheet pdf grade 6' and the malicious URL. This suggests a social engineering lure to trick users into clicking the link, which likely leads to further malicious content. The file also contains a large number of embedded PDF links, many pointing to Shopify domains, indicating a link farm strategy.

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/pify?keyword=equivalent+fractions+worksheet+pdf+grade+6
    • http://files.cityofamilliondreams.com/uploads/1/3/1/4/131406892/vubesewunevaxawepod.pdf
    • http://files.itiskismet.com/uploads/1/3/1/3/131380889/6c6d6eaf4b8.pdf
    • http://files.thehonestcatholic.com/uploads/1/3/0/8/130873921/3064113.pdf
    • http://files.philsutech.com/uploads/1/3/0/7/130775653/4039fe966b4e74.pdf
    • https://cdn.shopify.com/s/files/1/0429/7133/2767/files/80788338834.pdf
    • https://cdn.shopify.com/s/files/1/0431/7518/2496/files/92510522291.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30547733638.pdf
    • https://cdn.shopify.com/s/files/1/0435/1701/8267/files/image_line_sign_up.pdf
    • https://cdn.shopify.com/s/files/1/0434/8523/3318/files/grammar_test_advanced.pdf
    • https://cdn.shopify.com/s/files/1/0435/3405/7621/files/why_are_you_interested_in_programming.pdf
    • https://cdn.shopify.com/s/files/1/0440/9737/2312/files/18650308031.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9165/files/kemimixorimizefijedizusit.pdf
    • https://cdn.shopify.com/s/files/1/0432/6667/0745/files/ruradevag.pdf
    • https://cdn.shopify.com/s/files/1/0432/6726/0582/files/xotukilusazefiwoni.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_off00006e7f.bin
e242cf52580efae189f28c20a46df53eec6e991e16e8d0ca3567f49991519f82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7F 5868 bytes
font_01_sfnt_off00008291.bin
230511d729a558721ab21708a7b3430fd0522daa974738595d8328b5d6806886		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8291 9924 bytes

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