Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b964aa15f13eb2…

MALICIOUS

PDF

53.3 KB Created: 2020-08-05 11:10:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5833201246bfb8f78dc6dab408bccd5 SHA-1: 5a542aeeec39f10912d699e8420fe4b11b4f24d2 SHA-256: 67b964aa15f13eb266cb9d239b238bec2394f4e28114a9c66ec0c3bcd98a06eb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to Shopify domains hosting other PDFs, but one critical link redirects to a known malicious domain (ttraff.com). This suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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=bfg+story+book+pdf
    • http://files.nelsonscience.org/uploads/1/3/0/9/130969614/gudezuxoveposizil.pdf
    • http://files.allegrathompson.com/uploads/1/3/1/0/131070525/jivegafubaxezujonavo.pdf
    • http://vutex.zacharyscruggs.com/uploads/1/3/0/8/130873804/nufolutopulaj.pdf
    • http://fimekofi.ststephenmartyrschool.org/uploads/1/3/2/6/132680813/pumefu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/4405/1864/files/python_list_ports_command.pdf
    • https://cdn.shopify.com/s/files/1/0431/9661/2768/files/34725516105.pdf
    • https://cdn.shopify.com/s/files/1/0429/3145/4119/files/7671482846.pdf
    • https://cdn.shopify.com/s/files/1/0440/3711/1958/files/34155382948.pdf
    • https://cdn.shopify.com/s/files/1/0429/7555/9829/files/64939092845.pdf
    • https://cdn.shopify.com/s/files/1/0437/0821/9560/files/nodimoxepanututetom.pdf
    • https://cdn.shopify.com/s/files/1/0436/7430/4662/files/73788476851.pdf
    • https://cdn.shopify.com/s/files/1/0432/5651/2676/files/xelarebulefisenef.pdf
    • https://cdn.shopify.com/s/files/1/0430/6275/5490/files/61442167159.pdf
    • https://cdn.shopify.com/s/files/1/0431/5014/7745/files/wolatine.pdf
    • https://cdn.shopify.com/s/files/1/0432/8259/6004/files/55103577840.pdf
    • https://cdn.shopify.com/s/files/1/0433/9118/9157/files/47692460.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c07.bin
159d8bedcb5eb6a6672a01324d8457091faf7922a7606928eeea6475d07a499f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C07 5700 bytes
font_01_sfnt_off00009036.bin
7f7c013aa54ef67bff198b453659a58dc3c1abfd66156a35eb261596abe81069		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9036 5320 bytes
font_02_sfnt_off0000a271.bin
526dcd528439824fea39cc07b3719e53c7d6c4e344930ff336a5437b20a8ba1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA271 11548 bytes

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