Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf3d5874dd658f7…

MALICIOUS

PDF

46.5 KB Created: 2020-08-21 20:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12ef9a91ba3c13cb3de09e49c6c6b61a SHA-1: 9ca16fedb197677b375acd0478e590e51456b01f SHA-256: 9cf3d5874dd658f77cd71aadd1754a9ab108df4dfdaec8545e309aaa6582042d
152 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a redirector service (ttraff.cc), which is flagged as malicious. The document body, though heavily obfuscated, also contains the same malicious URL, indicating its likely purpose is to direct users to harmful content. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility and click-through rates to the malicious redirector.

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.cc/pify?keyword=shower+water+heater+installation+guide
    • http://files.whfryer.com/uploads/1/3/0/8/130874612/puloj.pdf
    • http://files.legendgolfcompany.com/uploads/1/3/2/8/132814791/fusug.pdf
    • http://files.colorwaysbyvicki.com/uploads/1/3/2/7/132741198/6474726.pdf
    • http://files.abbottconstruction360.com/uploads/1/3/0/7/130739340/7422542.pdf
    • http://files.youthdiscipler.com/uploads/1/3/0/7/130739593/fasowe_gabewiwigoko.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/44855609391.pdf
    • https://cdn.shopify.com/s/files/1/0433/3237/0584/files/82402801003.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/9908973296.pdf
    • https://cdn.shopify.com/s/files/1/0430/2408/9242/files/18036832913.pdf
    • https://cdn.shopify.com/s/files/1/0427/9628/6119/files/new_catholic_encyclopedia_vol_6.pdf
    • https://cdn.shopify.com/s/files/1/0431/2920/8988/files/ambon_bersimbah_darah.pdf
    • https://cdn.shopify.com/s/files/1/0428/9508/1625/files/tejotijunujofolari.pdf
    • https://cdn.shopify.com/s/files/1/0431/6902/2109/files/sidunupa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8200/6174/files/12947411255.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6864/files/diwoba.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5469/files/39946429513.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/test_1879eb6a-339e-4d45-a409-571cd94a4742.pdf?v=1594212285
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/95195940122.pdf
    • https://cdn.shopify.com/s/files/1/0435/9038/5821/files/attached_amir_levine.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_off00007551.bin
5192b3ccf09579efb0be898d3e5728d4461bfe4327d244b411301523bd9e035a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7551 5284 bytes
font_01_sfnt_off00008745.bin
03bdbe9b8c443c202d5a867b9984e25f6d4e9ea7af40bd16c70e18fd4aba315b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8745 10836 bytes

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