Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4758a3e837dc5be…

MALICIOUS

PDF

41.7 KB Created: 2020-08-25 04:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cfa023ea5dbae35c889ad1350d29df38 SHA-1: 46628352a9a67e87dc2098d1b1cf644464b476cf SHA-256: b4758a3e837dc5be9de322933a9fe9574b380c27facf440082a3468de90d5c2a
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.ru/pify?keyword=declaration+of+conformity+mdr+template'. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to disguise malicious content as a template. The ML classifier strongly supports the malicious nature of this PDF.

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=declaration+of+conformity+mdr+template
    • http://files.ffcardkeeper.com/uploads/1/3/2/7/132740606/47583.pdf
    • http://files.patagoniaorchardsllc.com/uploads/1/3/1/6/131637839/renuw-pevat.pdf
    • http://nunoj.spherenvp.com/uploads/1/3/1/6/131636813/8654046.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/6219719719.pdf
    • https://cdn.shopify.com/s/files/1/0439/0780/9448/files/47234055815.pdf
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/66243340594.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/98562026137.pdf
    • https://cdn.shopify.com/s/files/1/0440/9825/7048/files/dovapupifavijebepawafiki.pdf
    • https://cdn.shopify.com/s/files/1/0434/2048/3751/files/43750179382.pdf
    • https://cdn.shopify.com/s/files/1/0435/6790/6975/files/simplification_and_approximation_for_ibps_po.pdf
    • https://cdn.shopify.com/s/files/1/0438/0318/1218/files/adjective_exercises_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/22358801333.pdf
    • https://cdn.shopify.com/s/files/1/0430/6193/6290/files/wejunixasotik.pdf
    • https://cdn.shopify.com/s/files/1/0433/7680/3990/files/14329504828.pdf
    • https://cdn.shopify.com/s/files/1/0434/0737/6542/files/vi_cheat_sheet.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_off000063cc.bin
7428b13c4db78f6273ef5ecdc247f0fde9c784b897794a6fe209ec0ca3dc9092
pdf-font-stream PDF embedded font (sfnt) at offset 0x63CC 5224 bytes
font_01_sfnt_off00007587.bin
6955fd43209cec572f59a8134de729ed51f0b881aa90de83dd5d63785845ae77
pdf-font-stream PDF embedded font (sfnt) at offset 0x7587 10560 bytes