Malicious PDF — malware analysis report

Static analysis result for SHA-256 824468f6d576ef63…

MALICIOUS

PDF

37.0 KB Created: 2020-08-16 17:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eaeed1e642cc5c8566042082398192ba SHA-1: a673e6be6832ae626210a79fbbe058379de9118a SHA-256: 824468f6d576ef630f5abe9556386d14842b059d4039b78dc6bc596631644262
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection scheme. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a malicious intent to direct users to harmful 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.cc/pify?keyword=3d+bedroom+model+free
    • http://files.sevenskyexpert.com/uploads/1/3/0/7/130739674/zutez-mebijama.pdf
    • http://files.thetlacademy.shop/uploads/1/3/1/3/131384789/dupive-madelubupazape-dezarekinoza.pdf
    • http://files.kwfootography.com/uploads/1/3/1/4/131437475/rotoluf.pdf
    • http://files.stephipaigewellness.com/uploads/1/3/1/4/131454216/satuxu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/1686/2371/files/linux_networking_commands.pdf
    • https://cdn.shopify.com/s/files/1/0438/0111/6833/files/39847022450.pdf
    • https://cdn.shopify.com/s/files/1/0435/5152/2977/files/47146923611.pdf
    • https://cdn.shopify.com/s/files/1/0440/5533/0966/files/taxonomic_classification_of_animals.pdf
    • https://cdn.shopify.com/s/files/1/0432/2610/3971/files/48707724194.pdf
    • https://cdn.shopify.com/s/files/1/0440/6280/2070/files/74199122007.pdf
    • https://cdn.shopify.com/s/files/1/0430/2176/2723/files/vigiza.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/23267523528.pdf
    • https://cdn.shopify.com/s/files/1/0431/5466/9729/files/gituxotugije.pdf
    • https://cdn.shopify.com/s/files/1/0430/9948/8410/files/jamofez.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/buy_roblox_exploits.pdf
    • https://cdn.shopify.com/s/files/1/0433/6146/8574/files/pes_anserine_bursitis_treatment_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0434/4610/8312/files/fugume.pdf
    • https://cdn.shopify.com/s/files/1/0450/6117/7507/files/principles_of_aseptic_technique.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_off00005585.bin
78d1e3232704c8f798bd77b82417415eb8968b8dadcefcfdcb69df6ce351441b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5585 4876 bytes
font_01_sfnt_off000065fe.bin
c6720fb54326d378bd2095af938913d8546701af9cbd02ca9e83324bba4ebb56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65FE 9864 bytes

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