Malicious PDF — malware analysis report

Static analysis result for SHA-256 34c97750de742f6f…

MALICIOUS

PDF

47.7 KB Created: 2020-07-27 13:24:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f24266884085d9748d8adcd4e2ef7bcf SHA-1: 348d4708f619ce772ec3c97c6bc5321dbed55b2e SHA-256: 34c97750de742f6f78bbf423b0e704ce2c1542ddb06670c5020fe0c07ca19a0d
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics indicating malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The embedded URLs, particularly the one pointing to 'ttraff.ru', are highly suspicious and likely lead to malicious content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

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.ru/pify?keyword=context+clues+worksheets+exercise+2
    • http://files.titletownnews.com/uploads/1/3/2/3/132302732/numukoxok-kiletoxux.pdf
    • http://files.advancedurbanmarginality.com/uploads/1/3/1/3/131383586/7515916.pdf
    • http://files.blubocker.com/uploads/1/3/1/4/131438847/8cd681fd06b.pdf
    • https://cdn.shopify.com/s/files/1/0434/9945/4628/files/dokiloxebavupeludagarufe.pdf
    • https://cdn.shopify.com/s/files/1/0433/9974/1596/files/werigaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/zediselo.pdf
    • https://cdn.shopify.com/s/files/1/0428/0041/4883/files/27404804237.pdf
    • https://cdn.shopify.com/s/files/1/0438/4797/5062/files/70442345535.pdf
    • https://cdn.shopify.com/s/files/1/0434/7861/4168/files/39150482854.pdf
    • https://cdn.shopify.com/s/files/1/0430/8955/9705/files/45811308133.pdf
    • https://cdn.shopify.com/s/files/1/0437/3377/8597/files/61557787356.pdf
    • https://cdn.shopify.com/s/files/1/0431/4192/2977/files/23205569486.pdf
    • https://cdn.shopify.com/s/files/1/0428/8951/1068/files/22734395154.pdf
    • https://cdn.shopify.com/s/files/1/0428/8797/0975/files/gujamipago.pdf
    • https://cdn.shopify.com/s/files/1/0430/7540/3936/files/7546923622.pdf
    • https://cdn.shopify.com/s/files/1/0432/6542/5570/files/firepumab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gefoviliruvowej.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/
    • https://cdn.shopify.com/s/files/1/0438/4797/5062/files/7044234553

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007dd4.bin
ab3ecf8e84c153d48b793791f2d185454032ad3ce947a848852d0a5f314e8d9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD4 4940 bytes
font_01_sfnt_off00008eb2.bin
ed4d4865bbc26028f7e07da4c64ab8d6782aa655fe9d7f1052b8f05a93dbcc39		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB2 10196 bytes

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