Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31fb42cc53f43f6…

MALICIOUS

PDF

46.5 KB Created: 2020-08-09 23:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11306cdd3ea5935fd3aa6dc72a47f283 SHA-1: 3b51628fbf8db087b48bdbf5b95d8f9221fd050b SHA-256: f31fb42cc53f43f625e197082252ee864784bfdb386dd06fde671b4ade725943
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which are SEO-optimized and point to PDF files hosted on Shopify. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is disguised with a keyword related to "sanitary engineering books pdf". This suggests a phishing or scam attempt to redirect users to malicious content. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector is a strong indicator of malicious intent.

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.com/pify?keyword=sanitary+engineering+books+pdf
    • http://files.flyintofirstgrade.com/uploads/1/3/1/8/131856353/3ef5aa1d.pdf
    • http://files.littlevillacreations.com/uploads/1/3/1/4/131454238/xisatawojibatakilifu.pdf
    • http://files.hoapainting-services.com/uploads/1/3/0/8/130874370/gapozopesuvemesoji.pdf
    • https://cdn.shopify.com/s/files/1/0430/3765/5191/files/50191279433.pdf
    • https://cdn.shopify.com/s/files/1/0434/1995/9454/files/cambridge_igcse_economics_workbook_answers_susan_grant.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/zerarub.pdf
    • https://cdn.shopify.com/s/files/1/0431/6420/5216/files/55945814905.pdf
    • https://cdn.shopify.com/s/files/1/0439/4627/9080/files/rosolirixov.pdf
    • https://cdn.shopify.com/s/files/1/0437/5665/0650/files/excellence_in_business_communication.pdf
    • https://cdn.shopify.com/s/files/1/0432/7863/1072/files/55517892789.pdf
    • https://cdn.shopify.com/s/files/1/0431/3281/3469/files/16443330804.pdf
    • https://cdn.shopify.com/s/files/1/0431/6489/3344/files/nafesoleruf.pdf
    • https://cdn.shopify.com/s/files/1/0436/9648/8613/files/62396043279.pdf
    • https://cdn.shopify.com/s/files/1/0429/3722/1276/files/36156361708.pdf
    • https://cdn.shopify.com/s/files/1/0434/4764/8412/files/zajufavofomusila.pdf
    • https://cdn.shopify.com/s/files/1/0430/2045/1997/files/18869575725.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000052ee.bin
bfe1daa543be99067bcecee60e4a809a82b2953a041940a3fbf0b558435f7ef4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52EE 5376 bytes
font_01_sfnt_off00006540.bin
d5f47a5cbcc9fce6fec9afbe4e45540776a7832b768fa7032fffe4fca249a44c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6540 10084 bytes
font_02_sfnt_off000087dd.bin
5a4734b07e6b61c2d304cecce731c5ec8b3f83133482626c7d4a256b0baf3c3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87DD 16560 bytes
font_03_sfnt_off00009e98.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E98 4324 bytes

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