Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed88267c3bf9c48…

MALICIOUS

PDF

48.5 KB Created: 2020-08-08 22:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0a160a893b4a3ea78b7b077b13fe555 SHA-1: c57e6260a2ec26b32aa5522bbdd273ed2af68305 SHA-256: 1ed88267c3bf9c48e5455f295159331e94677e6b1dd6e3c2905e1d74bb1ed418
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though partially corrupted, includes text related to child development and the malicious URL, suggesting a lure. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious infrastructure via the embedded links.

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=brain%20development%20of%20a%20child%20pdf
    • http://files.naturalhealthyoga.com/uploads/1/3/1/8/131871390/552867.pdf
    • http://files.trinityunitedwallaceburg.com/uploads/1/3/0/7/130776648/48e2d6b.pdf
    • http://files.bruinjewelry.com/uploads/1/3/1/3/131398378/6810746.pdf
    • http://files.countryweddingsatcrookedriverfarm.com/uploads/1/3/0/8/130814531/9903601.pdf
    • http://files.juliereneephoto.com/uploads/1/3/1/6/131606003/zozajunazozar.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/30210177290.pdf
    • https://cdn.shopify.com/s/files/1/0437/1097/2053/files/buramuzuxawepure.pdf
    • https://cdn.shopify.com/s/files/1/0428/3128/2335/files/vuwagaburikozozelidenefe.pdf
    • https://cdn.shopify.com/s/files/1/0435/3225/5392/files/fajipaxusewugosekipufo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/jijikazavaselapitowopo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7555/7793/files/19895040893.pdf
    • https://cdn.shopify.com/s/files/1/0431/3579/5354/files/lumokazefuralefupafu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6799/8359/files/juvirotamarakad.pdf
    • https://cdn.shopify.com/s/files/1/0440/5841/1158/files/bobcat_s130_specs.pdf
    • https://cdn.shopify.com/s/files/1/0430/6065/8330/files/topovisavefagelipi.pdf
    • https://cdn.shopify.com/s/files/1/0438/4522/2550/files/modern_arabic_short_stories.pdf
    • https://cdn.shopify.com/s/files/1/0433/6776/0028/files/management_of_gestational_diabetes_mellitus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007291.bin
925aadf88d02bd1420a7ad702e2ddcc342ece73c2a7918563c012fbeb00fe2e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7291 5116 bytes
font_01_sfnt_off000083c6.bin
f38d6fe86a981f89abc396d7989bf8dc6d4388022e132b87e7e6f26c81d85d6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83C6 10120 bytes
font_02_sfnt_off0000a673.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA673 4324 bytes

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