Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a172fa465ddbab5…

MALICIOUS

PDF

38.6 KB Created: 2020-08-02 16:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c934a415d2a738f80b374f53dc18431c SHA-1: fb0dc2e7fa656eca56d08466b0f922e6d6682b04 SHA-256: 3a172fa465ddbab5bcd9ddc4d941d768ae31ead0068822aa926768bae5611e4d
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector service (ttraff.cc), and another identified a large PDF link farm hosted on Shopify. The document body contains obfuscated text and the redirector URL, suggesting a lure to external malicious content. The presence of many links, including one to a known malicious redirector, indicates a likely phishing or redirection attack.

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=example+of+enumdropdownlistfor
    • http://files.kawvalleyhearing.com/uploads/1/3/1/8/131856624/nuputanelelodal.pdf
    • http://files.michaeltsarion.com/uploads/1/3/1/6/131606393/ripogasofov_xibinet.pdf
    • http://files.wendellresearchgroup.com/uploads/1/3/1/8/131856146/f5765.pdf
    • http://files.carolynnsmontessori.com/uploads/1/3/0/7/130775528/wibilokuzagifiwuxok.pdf
    • http://files.homerbiology.com/uploads/1/3/1/6/131636988/liguwunu.pdf
    • https://cdn.shopify.com/s/files/1/0429/7339/7145/files/jirom.pdf
    • https://cdn.shopify.com/s/files/1/0431/8458/6909/files/41919208765.pdf
    • https://cdn.shopify.com/s/files/1/0430/2117/2897/files/futarego.pdf
    • https://cdn.shopify.com/s/files/1/0434/8647/8489/files/ruby_execute_shell_command.pdf
    • https://cdn.shopify.com/s/files/1/0435/1279/1192/files/printable_october_2016_calendar.pdf
    • https://cdn.shopify.com/s/files/1/0430/8225/2442/files/10087165801.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8427/files/kazowoxukiviluzarefise.pdf
    • https://cdn.shopify.com/s/files/1/0435/7872/0414/files/zuxamegubekox.pdf
    • https://cdn.shopify.com/s/files/1/0427/7341/4055/files/1690913682.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luvibuxunefipefijuli.pdf
    • https://cdn.shopify.com/s/files/1/0434/7002/8966/files/rezaxodabanevabijozitesis.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_off000058e8.bin
7ac1292d842dc3db45c8a13bc10206fbf9d12d5179d76b420b5983a89280bc2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58E8 5304 bytes
font_01_sfnt_off00006af7.bin
3a208e7948de8e16cb6a59fb5a29650416a55e120c7c3bce8670e93529dd3687		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF7 10104 bytes

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