Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c354a3131d34869…

MALICIOUS

PDF

41.8 KB Created: 2020-11-01 17:12:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: baa8d812e2371a922f81840c8a45298a SHA-1: 0871381435deca7db6975e1b557b2eadd5a29cbe SHA-256: 1c354a3131d348690fc92c9c233d4fefaf12da0136e831a930af560e5f57d277
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which, 'https://ggtraff.ru/123?keyword=samsung+wb150f+manual', is identified as a malicious redirector. The document also features a link farm with numerous external PDF links, suggesting a SEO poisoning or link farm tactic. The ML classifier strongly indicated maliciousness, and the presence of multiple PDF links points towards a technique aimed at driving traffic to malicious sites.

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://ggtraff.ru/123?keyword=samsung+wb150f+manual
    • https://pedomolakikivo.weebly.com/uploads/1/3/4/4/134440841/8644161.pdf
    • https://cdn-cms.f-static.net/uploads/4417327/normal_5f9d96d3f231b.pdf
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/e049838.pdf
    • https://cdn-cms.f-static.net/uploads/4389824/normal_5f937b6d7ab16.pdf
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/tugaxevedo-gujikasur-numuvo.pdf
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/sinaduwegeta.pdf
    • https://cdn-cms.f-static.net/uploads/4382189/normal_5f941f9768d11.pdf
    • https://cdn-cms.f-static.net/uploads/4380869/normal_5f8ebcb622fc4.pdf
    • https://mapipuluzobeb.weebly.com/uploads/1/3/1/3/131398440/gewug_lavegeto.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vinivuxo/mapefifoti.pdf
    • https://cdn.shopify.com/s/files/1/0481/7521/8837/files/react_native_maps_android_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0435/5696/2467/files/direct_democracy_and_indirect_democracy.pdf
    • https://s3.amazonaws.com/tenunud/senibipikato.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064f2.bin
f892616198fdc70d2d1867f48ff1e4ed0fd0015539fedd96289648a842ba25f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x64F2 5644 bytes
font_01_sfnt_off00007838.bin
5923fe0be9d8e615b9ab0848f0f179783b589f675bbbc6cefb923a4548f56384
pdf-font-stream PDF embedded font (sfnt) at offset 0x7838 10072 bytes