Malicious PDF — malware analysis report

Static analysis result for SHA-256 1db58cee4edce5fb…

MALICIOUS

PDF

39.9 KB Created: 2020-08-21 20:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d52908a79a8576f823e554c61d976e19 SHA-1: ce6dd6dc1140636b3fa0c904f351af17f5b2ebee SHA-256: 1db58cee4edce5fb82060386e91e7493e85043c0be34fb9835208cabf21519bd
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one pointing to a known malicious redirector. The document body text is largely garbled but contains the phrase 'Memories of school days song' and a URL that matches the malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting a tactic to manipulate search results or distribute malicious content. The ML classifier also strongly indicated maliciousness.

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=memories+of+school+days+song
    • http://files.manchestertaekwondo.com/uploads/1/3/1/4/131437632/e2f4f743.pdf
    • https://cdn.shopify.com/s/files/1/0440/8272/5029/files/cables_and_wires.pdf
    • https://cdn.shopify.com/s/files/1/0432/7872/9374/files/zimsec_a_level_economics_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/9437/6599/files/adriana_lecouvreur.pdf
    • https://cdn.shopify.com/s/files/1/0432/0755/7283/files/juganarixifaxon.pdf
    • https://cdn.shopify.com/s/files/1/0431/2078/7613/files/laxojurikinikiwopelagig.pdf
    • https://cdn.shopify.com/s/files/1/0430/3778/6265/files/83261662467.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/bujomewudedatagob.pdf
    • https://cdn.shopify.com/s/files/1/0432/4330/7175/files/spatial_reasoning_aptitude_test.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_off00005ff0.bin
ebabe1925e2824a96f728733dd90f5eb50f909b88de8b656cf7eed303632c7ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF0 5540 bytes
font_01_sfnt_off000072b0.bin
0cc3a498943aec3685bdd281b55eda14732c4a8cfa6ee2f5fd3e4ce90958582b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72B0 9636 bytes

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