Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5397673cc17e609…

MALICIOUS

PDF

51.6 KB Created: 2020-08-10 22:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e83034af5c4cb42c2ad2cf3eb684927e SHA-1: 0b5d0eeb06b655f9c16b1b9b7ad0caf84feb99b3 SHA-256: d5397673cc17e60967b300fbfbce4620654a8760693d94dea5438e95c628bb84
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, also contains URLs that are part of this link farm. The presence of numerous external links suggests a phishing or redirection attempt to lead 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.ru/pify?keyword=bootstrap+modal+iframe+pdf
    • http://pawikavu.ridgeandvalleyreptiles.com/uploads/1/3/1/4/131452922/3484541.pdf
    • http://files.monitzvocalstudio.com/uploads/1/3/0/7/130740065/kopanusasizer-rovudiburuxi-zikifove.pdf
    • http://puvazexe.spinteesprints.com/uploads/1/3/1/8/131871721/sifemowamil.pdf
    • http://files.harmonygroveenglishshepherds.com/uploads/1/3/1/4/131454345/2fa95.pdf
    • https://cdn.shopify.com/s/files/1/0433/4744/3865/files/4376284611.pdf
    • https://cdn.shopify.com/s/files/1/0440/4461/5830/files/pixopaninewamuvobafu.pdf
    • https://cdn.shopify.com/s/files/1/0428/2014/1223/files/riwizaxunozutokazodaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/resuwibeluma.pdf
    • https://cdn.shopify.com/s/files/1/0428/1974/8006/files/4821708685.pdf
    • https://cdn.shopify.com/s/files/1/0438/2624/9885/files/40442387462.pdf
    • https://cdn.shopify.com/s/files/1/0437/7857/2450/files/21642278443.pdf
    • https://cdn.shopify.com/s/files/1/0433/3741/6869/files/75549992865.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/30547733638.pdf
    • https://cdn.shopify.com/s/files/1/0434/8782/1981/files/269375156.pdf
    • https://cdn.shopify.com/s/files/1/0433/4891/8440/files/stories_behind_adventist_hymns.pdf
    • https://cdn.shopify.com/s/files/1/0451/7868/3541/files/definition_of_literature_by_different_scholars.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_off00007ce5.bin
014acacc988e012118805689dad148e8b4b5e385cbda52d1dd351e2bee3d5014
pdf-font-stream PDF embedded font (sfnt) at offset 0x7CE5 5236 bytes
font_01_sfnt_off00008e9e.bin
98727536deb433e122cc36b105dad4fc67eb5f6920f3745fdd2aa7b8bb411978
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E9E 16140 bytes