Malicious PDF — malware analysis report

Static analysis result for SHA-256 83440f00fae5dded…

MALICIOUS

PDF

45.4 KB Created: 2020-08-24 00:28:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 39899cc21d751ee5a2ee3377cac4a1e9 SHA-1: 6da2ee652927e02d423b2c406b6719bb2f4620b3 SHA-256: 83440f00fae5ddedc61552b010cbdd4011f10b47d920a30969102ff3b261f107
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, masquerading as a Windows update prompt. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically identifies this behavior. The document body also contains the text 'Update windows 10 pro manually' and the malicious URL, reinforcing the lure. The ML classifier also 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/pify?keyword=update+windows+10+pro+manually
    • http://files.pederistad.no/uploads/1/3/0/7/130739379/6470286.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/41732402988.pdf
    • https://cdn.shopify.com/s/files/1/0430/8307/1650/files/volap.pdf
    • https://cdn.shopify.com/s/files/1/0432/3383/7219/files/jitonaxigimusif.pdf
    • https://cdn.shopify.com/s/files/1/0434/4764/8406/files/niduvadozegoluporel.pdf
    • https://cdn.shopify.com/s/files/1/0434/9480/1568/files/65919526700.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65028435792.pdf
    • https://cdn.shopify.com/s/files/1/0466/5842/0901/files/vowitejika.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/xozetomufisatojobinutu.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_off00006597.bin
3fd392f9ba76e21b6fbce6e7cfe784b24be1ddc0c43d3421e3d0a74f3e0a3902		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6597 5368 bytes
font_01_sfnt_off000077d7.bin
f1b2282a399cd42213f31283778116818002bb911bf8704e6a6cdc7f782e1432		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77D7 10296 bytes
font_02_sfnt_off00009b16.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9B16 4324 bytes

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