Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd1529ffa660a62…

MALICIOUS

PDF

41.3 KB Created: 2020-08-08 12:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f916fcaa14f1aec0839b69287c52fddc SHA-1: 27c91ce8d810ce0d730436833a58da900c09bccf SHA-256: 8cd1529ffa660a62606b88c7a5684f6001906ef6ab65729596160cda97bc80c0
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though obfuscated, contains the URL that triggers the malicious redirector, suggesting a lure to a phishing or malware distribution site. No scripts were extracted from this sample.

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=mastro%20don%20gesualdo%20riassunto%20pdf
    • http://files.mrmairsphysedpage.com/uploads/1/3/2/7/132740384/5a419e248.pdf
    • http://files.robertnoonanartanddesign.com/uploads/1/3/1/3/131384070/susemijuxud_pituxefomag_siruri.pdf
    • http://files.northstarchapter.org/uploads/1/3/2/6/132681885/1780449.pdf
    • http://files.benabbydesignsco.com/uploads/1/3/1/0/131071037/dukibov-nilipuniku-lubexaduker-badafenekedomud.pdf
    • https://cdn.shopify.com/s/files/1/0437/9066/3832/files/kezuwozafovozisonobej.pdf
    • https://cdn.shopify.com/s/files/1/0434/4607/5554/files/sadurizegejezisesulanifij.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/nigizeriluju.pdf
    • https://cdn.shopify.com/s/files/1/0436/7450/1273/files/napupowekiwadexukub.pdf
    • https://cdn.shopify.com/s/files/1/0428/6591/8118/files/functional_approach_to_management.pdf
    • https://cdn.shopify.com/s/files/1/0439/9942/8766/files/canon_eos_rebel_t3_1100d_for_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0433/8240/7335/files/84197024983.pdf
    • https://cdn.shopify.com/s/files/1/0440/5841/1158/files/auto_increment_sql.pdf
    • https://cdn.shopify.com/s/files/1/0431/6620/4066/files/xotutexirelaresiwepu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9451/5614/files/72879930772.pdf
    • https://cdn.shopify.com/s/files/1/0435/4431/4011/files/fulton_algebraic_topology.pdf
    • https://cdn.shopify.com/s/files/1/0434/1799/3366/files/xezodejomon.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vitalifurefafimeribedewo.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_off000061fd.bin
0a7cd868ca00e2491e57c7a3e9222d64e921cad791aedc47c14d660436a4ae78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61FD 5216 bytes
font_01_sfnt_off000073d7.bin
fc5c91ec11214de98713ceb3717b876b08eb5d561b64b1212801a91673bd20f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D7 10748 bytes

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