Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c711d5851cabdf…

MALICIOUS

PDF

45.4 KB Created: 2020-07-31 06:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce4af33b3eb67f8a2d46dcc4b8408cd3 SHA-1: 3b2c5c09bbf70ac62bdc6045b502dcde5642d858 SHA-256: b6c711d5851cabdf2a2748b2e0227e34dd1b2dd4315123fa17342fb74f29d3e2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF file contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=cement+concrete+road+construction+process+pdf'. 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.ru/pify?keyword=cement+concrete+road+construction+process+pdf
    • http://files.connectedpropertyinvestment.co.uk/uploads/1/3/0/7/130775102/sejabifewenotovin.pdf
    • http://files.innerpeacepastor.com/uploads/1/3/2/6/132696111/1229389.pdf
    • http://files.studiobeeproductions.com/uploads/1/3/0/7/130738619/a63d9e2b4b134ac.pdf
    • http://files.mootingsyndicate.org/uploads/1/3/1/4/131483253/lewotidedimitufemini.pdf
    • http://files.dicksmarketgardens.com/uploads/1/3/1/8/131856770/8683407.pdf
    • https://cdn.shopify.com/s/files/1/0432/2364/6365/files/16090028519.pdf
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/nulifuwegejizukegorinik.pdf
    • https://cdn.shopify.com/s/files/1/0438/3608/0285/files/pofibimojifudafol.pdf
    • https://cdn.shopify.com/s/files/1/0433/7473/9607/files/20695267325.pdf
    • https://cdn.shopify.com/s/files/1/0434/9516/2022/files/nobixorijo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8868/2915/files/69913162279.pdf
    • https://cdn.shopify.com/s/files/1/0434/6744/0290/files/wiguroluxusuxemekuferebad.pdf
    • https://cdn.shopify.com/s/files/1/0434/7808/9878/files/93136983416.pdf
    • https://cdn.shopify.com/s/files/1/0430/2523/6121/files/94239858970.pdf
    • https://cdn.shopify.com/s/files/1/0429/2558/8639/files/gulesir.pdf
    • https://cdn.shopify.com/s/files/1/0433/6893/9672/files/66598752576.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_off00007441.bin
71e49f881417ea5fa440101d40b888ce0872bf23b671765bcbdc41959f7b3563
pdf-font-stream PDF embedded font (sfnt) at offset 0x7441 5172 bytes
font_01_sfnt_off000085b6.bin
53deccad58bee1f09e235369c62144796d349bb2f81ad436f13918166c085c73
pdf-font-stream PDF embedded font (sfnt) at offset 0x85B6 10088 bytes