Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6c06b4050c69f8…

MALICIOUS

PDF

52.7 KB Created: 2020-09-17 01:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40c6c2be2500e8bdf3aa322a543ae43b SHA-1: 2437d266388207222f504afc5717c16cc8acaf3d SHA-256: 6a6c06b4050c69f80d3b72ed7610b316ae2ebb3311013e26bf00d4c69e3e781c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though partially garbled, suggests a lure related to educational content ('cpm integrated 1 chapter 2 answers'). The presence of many external PDF links, including one pointing to a known malicious redirector, indicates a link farm or redirection scheme designed to lead users to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

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.me/wix?keyword=cpm+integrated+1+chapter+2+answers
    • http://lipijep.cleanerthanyou.com/uploads/1/3/1/4/131454766/4011869.pdf
    • http://files.peaceloveandfinancialplanning.org/uploads/1/3/2/6/132682739/fc2777c06.pdf
    • http://files.thelovehill.com/uploads/1/3/1/1/131164425/futubupagugil_xalef_fositaguxex.pdf
    • http://basodu.lfmssicentre.ca/uploads/1/3/0/8/130873804/todif_pojut.pdf
    • http://files.vancouveriraniandentist.com/uploads/1/3/2/6/132682235/mavenedo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89462818099.pdf
    • https://cdn.shopify.com/s/files/1/0440/0444/2262/files/muscle_build_workout_plan.pdf
    • https://cdn.shopify.com/s/files/1/0434/4122/5880/files/sufadulojugi.pdf
    • https://e43460be-b074-40b8-ab2d-07d425a08952.filesusr.com/ugd/9ff9b8_02f0e15f48104aa2ad256736a180a479.pdf?index=true
    • https://b6d4ee1f-4fc8-40d5-9fbc-8a330875687c.filesusr.com/ugd/01e791_c9b78b046e5547b3bbc639abab4c8970.pdf?index=true
    • https://4fa2bd28-b75e-4728-b2a5-6f77f2d95e1d.filesusr.com/ugd/008e52_1cda9c7966134c26a5b46b5262c5ed0b.pdf?index=true
    • https://0b3d6465-bb16-4e3a-aa49-9efc953194b8.filesusr.com/ugd/d63aaf_0d2c5930413142af8234c34b947f253a.pdf?index=true
    • https://4afb4621-e61d-444a-86c8-a8a11967ed70.filesusr.com/ugd/28b3f7_3286a0b0b3684d509539aa224a1d59fb.pdf?index=true
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008471.bin
e21b19b283816f339cb64227a49d35a3d38a194a1ee2de2cae1995ac2219572e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8471 5636 bytes
font_01_sfnt_off00009786.bin
e97a12a4b109ad0d92e3b3ddaad4bb2ef5e2be0c9746e946f094874bfaadf269		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9786 14900 bytes

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