Malicious PDF — malware analysis report

Static analysis result for SHA-256 7862af408a9c838b…

MALICIOUS

PDF

39.3 KB Created: 2020-08-15 09:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2086acd7288d8e2e99a75aab5b3f58cc SHA-1: b727e6f2afdcb0514d306c5f388fcece7a3701b8 SHA-256: 7862af408a9c838bb6b4b61d32b654f58abd4f8b01b0c7d4f0782ac30a0d744b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One prominent link directs to a known malicious redirector. The document body, though partially corrupted, contains text related to crafts and sweets, likely a lure to disguise the malicious intent. No scripts were extracted, but the presence of malicious links indicates an attempt to redirect the user to harmful content.

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.cc/wb?keyword=manualidades%20botellas%20decoradas%20con%20dulces
    • http://files.ottertotsplayandlearn.com/uploads/1/3/1/4/131454272/a52f4f79547fb.pdf
    • http://dekajupe.chadlehrmann.com/uploads/1/3/1/4/131437508/bobupusonugoza.pdf
    • http://files.ceciliatueros.com/uploads/1/3/0/8/130813948/judetipagezeked.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/gajuxudufemapoputawajuda.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/angularjs_6_tutorial_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5199/files/67322588237.pdf
    • https://cdn.shopify.com/s/files/1/0436/5461/1102/files/zetunoxawadazuxifesip.pdf
    • https://cdn.shopify.com/s/files/1/0433/4790/2629/files/bumekebiponenikoxamijun.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/pudunubiketipup.pdf
    • https://cdn.shopify.com/s/files/1/0437/0271/4536/files/22686025704.pdf
    • https://cdn.shopify.com/s/files/1/0431/8196/5461/files/83567417687.pdf
    • https://cdn.shopify.com/s/files/1/0434/2936/3878/files/81424830242.pdf
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/31454567366.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67264452348.pdf
    • https://cdn.shopify.com/s/files/1/0439/1878/6728/files/71900454380.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a4a.bin
a3ec72a9a0779d7f5b132445d3189830a0e5b234ab7c644cd314965792d8637a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A4A 5076 bytes
font_01_sfnt_off00006b8f.bin
7e7df3710e10964156480d11c6f4af44fe94dd6b39d39c770581aa1d2cf3845f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B8F 10720 bytes

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