Malicious PDF — malware analysis report

Static analysis result for SHA-256 37836b101064a06e…

MALICIOUS

PDF

39.3 KB Created: 2020-08-26 19:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 073a12104ec97f88998ca8c08489b525 SHA-1: 4340dd11610e912505c6ebb81b0c49e6aa14f4fc SHA-256: 37836b101064a06e79d7a2af7829edf495ecbdc964eabea4f5940290906f1786
150 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though partially corrupted, includes text related to 'Past simple past continuous exercises pdf esl', suggesting a lure to disguise the malicious intent. The primary malicious URL is ttraff.ru, which is flagged as a redirector. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=past+simple+past+continuous+exercises+pdf+esl
    • http://penufawem.unlimitedpotentialstl.com/uploads/1/3/2/6/132681647/7313179.pdf
    • http://files.phktsda.com/uploads/1/3/1/4/131438245/c53a9652.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xogasetixudaxaw.pdf
    • https://cdn.shopify.com/s/files/1/0429/4085/8527/files/mumuniniti.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3288/files/dubarosikojematata.pdf
    • https://cdn.shopify.com/s/files/1/0434/3873/5517/files/nitro_free_download_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0434/4109/4817/files/29202058531.pdf
    • https://cdn.shopify.com/s/files/1/0435/9903/6573/files/exam_booster_cambridge_pet.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/rubewuba.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_off00005be3.bin
ed92639a506bbf45ab3b0754ef8fab0bf3cd9045c62c0ceefb6cf97549cb86cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE3 5372 bytes
font_01_sfnt_off00006e0a.bin
7066a9627d25124962e7d172e5c386a0d65930117f463d9c1f49b456d72f7c36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0A 10272 bytes

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