Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8dfd69294baf53d…

MALICIOUS

PDF

38.3 KB Created: 2020-08-11 18:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18b0b8f34a9feb2e63a22c8636e01e4b SHA-1: 7ea628162f58afeebed7c68198434b07bf454f6d SHA-256: c8dfd69294baf53dba0a45577e4ea096c985fd687dbabb8fbca48d0a462d5025
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=belanjawan+johor+2020+pdf'. Another heuristic identified a large external PDF link farm, suggesting a potential SEO poisoning or phishing campaign. The document body contains garbled text but also includes the suspicious URL and several Shopify-hosted PDF links.

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=belanjawan+johor+2020+pdf
    • http://files.adelainemuth.com/uploads/1/3/1/1/131164358/0157f846.pdf
    • http://zupinawap.yvckirksville.org/uploads/1/3/0/9/130969723/4162928.pdf
    • http://files.alakazamtravel.com/uploads/1/3/2/6/132681066/9811e5.pdf
    • https://cdn.shopify.com/s/files/1/0431/9880/8224/files/26548432526.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4033/files/dr_dog_babette_cole.pdf
    • https://cdn.shopify.com/s/files/1/0446/1549/9939/files/environmental_and_material_flow_cost_accounting_principles_and_procedures.pdf
    • https://cdn.shopify.com/s/files/1/0427/7692/0220/files/botudifofefofovikavuzatid.pdf
    • https://cdn.shopify.com/s/files/1/0433/7857/3464/files/14234491458.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/54180338159.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/36726725464.pdf
    • https://cdn.shopify.com/s/files/1/0428/5657/9228/files/99895391613.pdf
    • https://cdn.shopify.com/s/files/1/0431/5935/5558/files/36398502802.pdf
    • https://cdn.shopify.com/s/files/1/0427/7963/9967/files/wevujaxasafesonogilowev.pdf
    • https://cdn.shopify.com/s/files/1/0431/7085/7122/files/9038719087.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004bea.bin
a505a63221cff201dca7f56a696809a9becbaaf297b96053412e09ff221f5c9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BEA 5100 bytes
font_01_sfnt_off00005d49.bin
df86572b285bc265394a33e4b15d98450f92d7c686d5d81dd1ad2a3727ddbbb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D49 9736 bytes
font_02_sfnt_off00007ea9.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EA9 4324 bytes

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