Malicious PDF — malware analysis report

Static analysis result for SHA-256 554484f6cb16ac8e…

MALICIOUS

PDF

45.2 KB Created: 2020-08-22 17:37:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b486809f52b35d10a7157ecd93ab5b6 SHA-1: e39f3c89902f0457e507bd80e36ace394deaf019 SHA-256: 554484f6cb16ac8e9a8a730eb35006d6f8b2f9882aee47f70711b56ee90a80b1
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external links, suggesting a link farm or spam distribution. The ML classifier also strongly indicated maliciousness. The embedded URL `https://ttraff.cc/pify?keyword=bleacher+report+ny+knicks` is likely part of a redirection chain to malicious content, while the numerous `cdn.shopify.com` links appear to be part of a link farm designed to improve SEO for spam or phishing 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/pify?keyword=bleacher+report+ny+knicks
    • http://files.theplansource.org/uploads/1/3/1/4/131453397/lurusaxibowi-susazu.pdf
    • http://kanepu.sargentbuilding.co.nz/uploads/1/3/1/6/131607712/lusovu.pdf
    • http://rexov.beautifulbrideevents.com/uploads/1/3/0/7/130775386/5201096.pdf
    • https://cdn.shopify.com/s/files/1/0446/8034/7801/files/arbitrage_trading_strategy.pdf
    • https://cdn.shopify.com/s/files/1/0429/8178/5753/files/lidagegepidewonidi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32732230761.pdf
    • https://cdn.shopify.com/s/files/1/0429/5829/1093/files/classical_mechanics_taylor_solution_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/9427/0371/files/teoria_del_imperialismo_cultural.pdf
    • https://cdn.shopify.com/s/files/1/0435/9890/5507/files/android_sdk_avd_manager_command_line.pdf
    • https://cdn.shopify.com/s/files/1/0434/6304/9376/files/problems_of_budgeting_in_nigeria.pdf
    • https://cdn.shopify.com/s/files/1/0439/1557/5464/files/11049082383.pdf
    • https://cdn.shopify.com/s/files/1/0430/3765/5191/files/tests_for_present_simple.pdf
    • https://cdn.shopify.com/s/files/1/0431/4667/4336/files/pabogojezuwaguzenegon.pdf
    • https://cdn.shopify.com/s/files/1/0429/7401/9740/files/pibikebilagaxazinuzajo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4642/0132/files/32826556047.pdf
    • https://cdn.shopify.com/s/files/1/0431/7036/5589/files/magemifeke.pdf
    • https://cdn.shopify.com/s/files/1/0430/0364/2007/files/samekeja.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_off000072e0.bin
f0716828ae44dff156d9deefa9c6c6bffb657ddcd2e9755696752703fef19407		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E0 5236 bytes
font_01_sfnt_off000084a6.bin
9dfc74c9a810eec44eb6f7659711a8af289a09724f83fdc1b2bf78148cd06612		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84A6 10216 bytes

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