Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa23f556739da52…

MALICIOUS

PDF

42.1 KB Created: 2020-08-11 07:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a309be95f2dd36b8ff264e52d65ab64e SHA-1: 19c3382cf83b8abd2e65737fdef259a5c5974cba SHA-256: 2fa23f556739da52cea65da6f3ae5b9701e15c2702a98d104f5246cf8d4e487e
150 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to a redirector service. The document body, though heavily corrupted, contains text suggesting it is a "book pdf download" lure, which aligns with the PDF_SEO_LINK_FARM heuristic. The primary malicious URL identified is https://ttraff.cc/pify?keyword=this+boy+s+life+book+pdf+download, which is flagged as a malicious redirector.

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.cc/pify?keyword=this+boy+s+life+book+pdf+download
    • http://files.wildfenstudio.com/uploads/1/3/0/8/130814058/95bc1abb70e8.pdf
    • http://files.bookworksbyday.com/uploads/1/3/0/9/130969458/1360371.pdf
    • http://kinis.junglepixiebelize.com/uploads/1/3/1/0/131071164/7311735.pdf
    • https://cdn.shopify.com/s/files/1/0448/9238/9531/files/nef_business_plan_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/6480/2982/files/16331392132.pdf
    • https://cdn.shopify.com/s/files/1/0436/0234/6148/files/mufipi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7426/4993/files/75294800427.pdf
    • https://cdn.shopify.com/s/files/1/0435/7508/3169/files/10949423470.pdf
    • https://cdn.shopify.com/s/files/1/0433/7070/9142/files/lore_of_the_bloodlines.pdf
    • https://cdn.shopify.com/s/files/1/0429/9712/1178/files/terraria_cool_houses.pdf
    • https://cdn.shopify.com/s/files/1/0438/1877/8781/files/puzef.pdf
    • https://cdn.shopify.com/s/files/1/0432/0913/0143/files/26021788290.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/domifuvazakedizimatopifi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6229/files/nutatosinobonixilajafag.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_off00006613.bin
0e7516779f4fa29b43361a69bc8e7635b2e06ebebb9b8fda27960cf25ec7baa1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6613 5380 bytes
font_01_sfnt_off00007868.bin
e282bc11da30244945c7d4069cafa9bcb7cbc8ef600b49e9f5a18c9678f24cb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7868 10288 bytes

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