Malicious PDF — malware analysis report

Static analysis result for SHA-256 eeab461b8345f488…

MALICIOUS

PDF

58.9 KB Created: 2020-08-29 19:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfb5709260401a66d3ca9e9aae55f87d SHA-1: 4953a26c745017f650b3a5e316897478823b925a SHA-256: eeab461b8345f488efa036acfb25e3c689e640a5c0dbb5d8efda268a4c9df9af
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, ttraff.cc, which is disguised as content about interview questions. The document also features a large number of external links, many pointing to static.usrfiles.com, suggesting a link farm or SEO poisoning tactic to drive traffic to the malicious redirector. The ML classifier 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/wix?keyword=manual+testing+interview+questions+edureka
    • https://static.usrfiles.com/ugd/b8c837_5aa1d0119b9d486fbdd773e7bc99f8a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_90e518543667433cbb1d34ab83fc318a.pdf
    • https://static.usrfiles.com/ugd/b8c837_2ecca8e6416e440db3b65cac44bffcda.pdf
    • https://static.usrfiles.com/ugd/34ec99_5a7ae6aba7b440eaaa41ad6ef8d5b4cf.pdf
    • https://cdn.shopify.com/s/files/1/0434/4070/1606/files/sirobedazose.pdf
    • https://static.usrfiles.com/ugd/b8c837_b791972170c8475b940e8e287c149e54.pdf
    • https://static.usrfiles.com/ugd/5b9a87_3ce9fc3f7fa04c96a85d8358e1fcd105.pdf
    • https://static.usrfiles.com/ugd/dc98cc_411b96b45d0c4c5fb7383f244ef31ea7.pdf
    • https://static.usrfiles.com/ugd/b8c837_b9d89722f75f483983a8e7d72e5640f8.pdf
    • https://static.usrfiles.com/ugd/b8c837_5a7a2156f61f4a679682296dcb0f3d50.pdf
    • https://cdn.shopify.com/s/files/1/0429/2011/6387/files/mapatofiza.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jojanasesejunuveko.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_off00009fb5.bin
a2157af061728a2e07bde4abb789b25684c2e57117d46771695b6bf31d26ac6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FB5 5340 bytes
font_01_sfnt_off0000b1fc.bin
f52f27a35098591ea493a691d75b0fb8804b0b5124854edfb78fd6551a90bd5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FC 14560 bytes

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