Malicious PDF — malware analysis report

Static analysis result for SHA-256 52c6e9f659a06eda…

MALICIOUS

PDF

41.2 KB Created: 2020-08-05 13:15:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bfb38554e9a3a79f427e312eca1c747 SHA-1: 79ab8e4b69410efe0b36e84bdd05c07a6243dc9e SHA-256: 52c6e9f659a06eda34ac5099c73c3391ceefbc61a69d18ce1c6d9cb5f18f112d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to a known malicious redirector infrastructure at `https://ttraff.cc/wb?keyword=2%20and%203%20dimensional%20shapes%20worksheets%20kindergarten`. The document body, though heavily obfuscated, also contains this URL, suggesting the primary purpose is to redirect the user to malicious content. The ML classifier strongly supports the malicious verdict.

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=2%20and%203%20dimensional%20shapes%20worksheets%20kindergarten
    • http://files.positivescanning.com/uploads/1/3/1/0/131071137/vuxalavezimuwiwafod.pdf
    • http://pojejolon.idyllwildcabins.com/uploads/1/3/1/4/131407164/6553e24313b6.pdf
    • http://files.chromosome3andme.com/uploads/1/3/1/4/131454355/watabijexupo-jagaxepefuj-pezubewajo.pdf
    • http://files.nelsonrmc.org/uploads/1/3/0/7/130775759/4182264.pdf
    • http://bopenetad.resurrectionvineyard.com/uploads/1/3/1/8/131857631/larukexo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nanejixiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/2870/0571/files/88904255951.pdf
    • https://cdn.shopify.com/s/files/1/0430/6334/5301/files/xabojamo.pdf
    • https://cdn.shopify.com/s/files/1/0434/3041/2437/files/fetaxiw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gipal.pdf
    • https://cdn.shopify.com/s/files/1/0433/3830/1594/files/ishakamusa_barashango.pdf
    • https://cdn.shopify.com/s/files/1/0428/1607/7991/files/linigajuzipematedokemurar.pdf
    • https://cdn.shopify.com/s/files/1/0433/4521/5656/files/ruravor.pdf
    • https://cdn.shopify.com/s/files/1/0436/7450/1273/files/wuniwokonabugo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/suvodusoxavukajewanezatuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/8988/7396/files/60300178118.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_off000061b1.bin
05499f00a07d1abcebe4c21aa463b4475edb76d8b9ec8e54ee4bc830ee21354d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61B1 5732 bytes
font_01_sfnt_off00007516.bin
064afef0f933be2029532a68bfeb147b1cca8c92451a51320fde4c5a1157ebef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7516 10088 bytes

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