Malicious PDF — malware analysis report

Static analysis result for SHA-256 06c907b687c6f47a…

MALICIOUS

PDF

71.4 KB Created: 2020-08-07 10:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d5e3964412162c11b5559d30fee591b SHA-1: ef023c07eb80521066beec3a14e7733ff3b6f635 SHA-256: 06c907b687c6f47a25098829693aa56f359e5ba95bb334edec4ade370bf49fa5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to a link farm designed to host PDF files. One prominent URL, https://ttraff.com/pify?keyword=benchmarking+pdf+download, is identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to PDF benchmarking and download, aligning with the link farm and 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.com/pify?keyword=benchmarking+pdf+download
    • http://files.cashfromtreasures.net/uploads/1/3/1/3/131379054/doxajegom.pdf
    • http://files.salon225.com/uploads/1/3/1/3/131383645/9b0fe51066.pdf
    • http://files.thegathering4coacheswives.com/uploads/1/3/1/3/131383764/100111.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/rotukiladadaxebu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0661/3912/files/nosoruke.pdf
    • https://cdn.shopify.com/s/files/1/0433/5288/3352/files/sonusufotutaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/bovazatevarupu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7209/3336/files/fogevewosorozolaruripo.pdf
    • https://cdn.shopify.com/s/files/1/0430/0265/8979/files/xidasigawurobobidilivo.pdf
    • https://cdn.shopify.com/s/files/1/0432/3429/5966/files/98052704378.pdf
    • https://cdn.shopify.com/s/files/1/0438/5384/0534/files/fisetawexizotagip.pdf
    • https://cdn.shopify.com/s/files/1/0435/9543/2099/files/emoticon_rolling_eyes.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0072/files/18059113255.pdf
    • https://cdn.shopify.com/s/files/1/0436/0781/8398/files/audi_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/8923/1000/files/vukudagofa.pdf
    • https://cdn.shopify.com/s/files/1/0430/9444/2137/files/principles_of_agronomy_by_yellamanda_reddy_download_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/3318/8759/files/python_programming_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/7529/5640/files/retribution_paladin_stat_priority.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd75.bin
e12ef0282f9544d4156de07a72a69eb9930a0e8aa716d849bc8723373cf8fe86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD75 5596 bytes
font_01_sfnt_off0000e067.bin
5e3ef1c5ad61c93ea86963dcfe084a61d974537dfbc7a9b2654f81e91454cb2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE067 15436 bytes

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