Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe531634e433a0c…

MALICIOUS

PDF

49.6 KB Created: 2020-08-05 00:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d44bbd09ddca2dccc7b609afe417c35 SHA-1: bc6712e780c09c076dd495548b555464501f5e0a SHA-256: 2fe531634e433a0cfc5a04037dadf71fc8bf81259e62d03d91966fc0a625a6e4
152 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm or SEO manipulation, with a high density of embedded external links. One of these links, 'https://ttraff.ru/pify?keyword=a+catholic+introduction+to+the+bible+the+new+testament+pdf', is identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious, supporting the assessment of malicious intent.

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=a+catholic+introduction+to+the+bible+the+new+testament+pdf
    • http://files.amysommerville.com/uploads/1/3/1/4/131483386/pewanizunod_votezafepukex_vetazeguwewimi.pdf
    • http://files.thehistorytrail.net/uploads/1/3/1/1/131163666/sijogoxon.pdf
    • http://files.kimberleyvisioncare.com/uploads/1/3/1/4/131483143/13c5e.pdf
    • http://files.dianegravel.com/uploads/1/3/1/6/131636745/nadavigazinanafe.pdf
    • http://files.singersandactorsworkshop.com/uploads/1/3/2/7/132740218/mubazaxumadajag.pdf
    • https://cdn.shopify.com/s/files/1/0436/4835/2406/files/rerizego.pdf
    • https://cdn.shopify.com/s/files/1/0430/8641/3985/files/regex_empty_line.pdf
    • https://cdn.shopify.com/s/files/1/0440/9311/2472/files/rifts_world_book_8.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fadanamimurusekebunom.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7719/files/9664971076.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/bapejasumaduz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/37055304824.pdf
    • https://cdn.shopify.com/s/files/1/0436/9652/1369/files/matplotlib_3d_plot.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/punafaga.pdf
    • https://cdn.shopify.com/s/files/1/0432/1047/3633/files/9674590730.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31906594002.pdf
    • https://cdn.shopify.com/s/files/1/0440/5903/3752/files/zinamefadivef.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9432/files/borozifiso.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_off00008297.bin
9819732990dbae9135d4aeb3d0776eb16d50d58accf1a031e6a47c8b974c1d40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8297 5616 bytes
font_01_sfnt_off0000958f.bin
313a8c9d703c5638a938a549e5d4bc64838e284972dd5c2490a717b3cc25bfe8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x958F 10344 bytes

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