Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31ad7f132aee7f3…

MALICIOUS

PDF

45.9 KB Created: 2020-08-14 02:37:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09f25166b960e128b0839e5b0a37ea08 SHA-1: fc730e1d3e2f8c8d534414a0bbb689c19b37f3f1 SHA-256: d31ad7f132aee7f357ae807999d5d12992841e4626b6b4c5183cfc38124fc4a9
152 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious and contains a large number of embedded links, many of which point to domains associated with link farms or redirectors. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=cdc+full+form+in+education'. The document body contains garbled text but also includes the same URLs found in the heuristics, suggesting a deliberate attempt to obscure the malicious nature of the links. No scripts were extracted from this sample.

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=cdc+full+form+in+education
    • http://sexun.elvesandmorewestmi.org/uploads/1/3/2/6/132681399/1890323.pdf
    • http://files.sagehousebathnbody.com/uploads/1/3/0/9/130970005/5200238.pdf
    • http://files.carlystrong.com/uploads/1/3/1/4/131437669/7601785.pdf
    • http://files.clonmelchildcare.com/uploads/1/3/0/9/130969690/aae4852efb.pdf
    • http://files.cjsclimbandplay.com/uploads/1/3/0/7/130739910/9084940.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/pikawilisawo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8380/9439/files/gobeguwotupaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/50098851224.pdf
    • https://cdn.shopify.com/s/files/1/0434/8156/3298/files/wagepipozekedufejagu.pdf
    • https://cdn.shopify.com/s/files/1/0432/6375/4404/files/aradhana_mp4_video_songs.pdf
    • https://cdn.shopify.com/s/files/1/0435/1049/7434/files/deep_purple_child_in_time_guitar_tab.pdf
    • https://cdn.shopify.com/s/files/1/0430/4506/0762/files/dezoxetazipaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/4899/2930/files/97964790006.pdf
    • https://cdn.shopify.com/s/files/1/0432/8577/4502/files/tutorial_in_introductory_physics_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0431/5561/9994/files/electronically_sign_a_adobe_acrobat.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/dexojejatofura.pdf
    • https://cdn.shopify.com/s/files/1/0431/8806/0320/files/78992978383.pdf
    • https://cdn.shopify.com/s/files/1/0434/6845/6086/files/nokigakiwurewuzesakanine.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_off0000764f.bin
64d8ffad8482ad8079801dea50e7e9cac566531aeb4d4cc12063585f72c98e30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x764F 4896 bytes
font_01_sfnt_off000086d1.bin
99686aa82eceb3c3a0bc69ac6a777df76e758199e87f30703c0c4b29b9c67e4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86D1 10376 bytes

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