Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac639e39ecf245e6…

MALICIOUS

PDF

43.1 KB Created: 2020-08-29 17:02:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37f179de48414a85665fe5a05fd4ed8a SHA-1: 5c0d7bef58a23e7fbb424d09b70225cc70c297a3 SHA-256: ac639e39ecf245e6e218349984fcafaca7a9529b8c7165630a1e5b4e790c08cd
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to PDF files hosted on Shopify. One of these links, https://ttraff.ru/wix?keyword=if+afb+dfe+what+must+be+true, is identified as a known malicious redirector. The ML classifier also flagged this PDF as malicious with high confidence. The document body appears to be obfuscated or corrupted, but the presence of the malicious redirector and the link farm strongly suggest a malicious intent, likely to redirect users to harmful content.

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.ru/wix?keyword=if+afb+dfe+what+must+be+true
    • https://cdn.shopify.com/s/files/1/0435/0741/7253/files/gelibukipidekere.pdf
    • https://cdn.shopify.com/s/files/1/0429/6038/8262/files/31770815764.pdf
    • https://cdn.shopify.com/s/files/1/0429/2100/1119/files/68700258077.pdf
    • https://static.usrfiles.com/ugd/b8c837_32b491d49e1848e19ad9475d7242f010.pdf
    • https://static.usrfiles.com/ugd/b8c837_88337e4664b04b30ac83f69ffabd745e.pdf
    • https://static.usrfiles.com/ugd/b8c837_0588d48a38b3407ba93de509ed60e423.pdf
    • https://static.usrfiles.com/ugd/b8c837_bf2b371bcc72483caeeb6e56aeef2e0a.pdf
    • https://static.usrfiles.com/ugd/b8c837_01f845592c524cffa7817b03ee69df8f.pdf
    • https://cdn.shopify.com/s/files/1/0434/9198/3512/files/canara_bank_neft_form_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/2308/8290/files/93750691094.pdf
    • https://cdn.shopify.com/s/files/1/0438/1186/4738/files/bise_fsd_9th_result_2019_gazette.pdf
    • https://cdn.shopify.com/s/files/1/0440/2518/4421/files/9850613638.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004480.bin
e2b93d5bb089f3683b771bb5cf4acfbb4c61717b0a363792b06662909b527362		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4480 4900 bytes
font_01_sfnt_off00005530.bin
c2030721305d3dff932a796ef9fcbee7b07f5ef72df9e8051d29cec0e850832a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5530 10148 bytes
font_02_sfnt_off0000781f.bin
3d81bc0b175c034575e1ce09f4ed2bd758c6158782f772f5ed482aabb98b2f19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x781F 17168 bytes
font_03_sfnt_off00009127.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9127 4324 bytes

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