Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe651d76a652f46…

MALICIOUS

PDF

44.2 KB Created: 2020-08-07 23:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 187c052b3ffbee0563480bcf86cd2028 SHA-1: ed7317f47e371a08f522ba1e7384162a6bf624c9 SHA-256: cfe651d76a652f46056ccbdd9718f57bd0fc29806f8a03e238da7f6ae7063355
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources hosted on platforms like Shopify and other domains. One critical heuristic identified a link to a known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=biological+oceanography+pdf'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to drive traffic to malicious sites.

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=biological+oceanography+pdf
    • http://files.latinfestival.ca/uploads/1/3/1/4/131453065/jexetovumufosugipa.pdf
    • http://files.penreviews.net/uploads/1/3/0/8/130815009/fewuturi.pdf
    • http://files.divorcecoachingandconsulting.com/uploads/1/3/0/8/130874518/bejam-soselovorifat-tekumubobup-powidonuvewadar.pdf
    • http://files.truelightchristianschool.org/uploads/1/3/2/6/132681477/8419171.pdf
    • http://files.truelightchristianschool.org/uploads/1/
    • https://cdn.shopify.com/s/files/1/0432/6067/4198/files/dopawugedeferosegaxuxa.pdf
    • https://cdn.shopify.com/s/files/1/0430/5498/9466/files/notakelemar.pdf
    • https://cdn.shopify.com/s/files/1/0429/7247/9647/files/82759028245.pdf
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/danevin.pdf
    • https://cdn.shopify.com/s/files/1/0437/6759/5165/files/parts_of_computer_software.pdf
    • https://cdn.shopify.com/s/files/1/0433/8706/0375/files/67517684796.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/tujanowuteza.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/bufogitutelosumekagonaxok.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20597849085.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bifivejeg.pdf
    • https://cdn.shopify.com/s/files/1/0430/7186/4993/files/24124287923.pdf
    • https://cdn.shopify.com/s/files/1/0430/4555/2290/files/69621153226.pdf
    • https://cdn.shopify.com/s/files/1/0434/3493/4429/files/wetupe.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_off00006fbb.bin
fb0dce93e2ad79c06972bceb6f0e6995965e38341797e7fe601d75a032feeaf2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FBB 5392 bytes
font_01_sfnt_off00008219.bin
92ae77940f14c9156781ee451309ca8a9f1638065da4d3deab3486be184d5fb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8219 9876 bytes

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