Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfd406f938ef7eb…

MALICIOUS

PDF

37.4 KB Created: 2020-09-03 01:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed98093918e9626fb55a62b31a053aca SHA-1: e1253d4b653677c65d87902c539a15e43b97191e SHA-256: fcfd406f938ef7eb87e38e311a9f4f40aa01d3c9a0428b1aa6d6470add3aa278
152 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, pointing to 'https://ttraff.club/wix?keyword=infographic+pyramid+template+psd'. This link is presented within the document body, likely as a lure for users to click. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to distribute malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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.club/wix?keyword=infographic+pyramid+template+psd
    • https://cdn.shopify.com/s/files/1/0432/0080/7070/files/neguxaxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/37687758373.pdf
    • https://cdn.shopify.com/s/files/1/0430/1009/7313/files/72453839424.pdf
    • https://cdn.shopify.com/s/files/1/0432/7614/0710/files/catana_comics_stickers_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/1593/7948/files/pulakaxugafamutub.pdf
    • https://static.usrfiles.com/ugd/a91264_ae460774cb2846698781fbb35dc0655b.pdf
    • https://static.usrfiles.com/ugd/1cfe37_8129268bf42c4266b5add89253603520.pdf
    • https://static.usrfiles.com/ugd/4c76bf_6defcf7ad7994f5fbb3f0ff5467e64e5.pdf
    • https://static.usrfiles.com/ugd/32acb1_1335065a641b4a43a57a744f6a36ad26.pdf
    • https://static.usrfiles.com/ugd/3fb742_30f55171e7444401857eed4fce3d178d.pdf
    • https://static.usrfiles.com/ugd/21a131_7d4d41ab80a84699aca13e359f0f3531.pdf
    • https://cdn.shopify.com/s/files/1/0430/3103/6053/files/hardiplank_siding_installation_guide.pdf
    • https://cdn.shopify.com/s/files/1/0436/9770/1032/files/gulodiditosow.pdf
    • https://cdn.shopify.com/s/files/1/0436/8944/3483/files/29424076630.pdf
    • https://cdn.shopify.com/s/files/1/0433/0923/6374/files/22994036259.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004810.bin
fa2480ea8618517e5a5a54a470841d83f337c67d6e009adcf5b713f51b99d671		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4810 5396 bytes
font_01_sfnt_off00005a3d.bin
603a3023e04a8316653e5b2bed8ba5333f1c4a0c68210a833ec4b05906ee7745		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A3D 9472 bytes
font_02_sfnt_off00007a99.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A99 4324 bytes

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