Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab152aabcc9045b2…

MALICIOUS

PDF

48.0 KB Created: 2020-10-21 21:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1df3f2ed5f35e095208be7b904dab54 SHA-1: 9e2d757a40b0070043a0988ca7c98be68a4f2c25 SHA-256: ab152aabcc9045b2a1aac1913727a8e15c7a8c6908592a9fbf1f7218c8e3614b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of a malicious redirector suggests an attempt to lead users to harmful content or phishing sites, aligning with spearphishing attachment tactics.

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=android+developer+save+bitmap+to+file
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5f89dc77e0579.pdf
    • https://cdn-cms.f-static.net/uploads/4371014/normal_5f8ee77eaa1f0.pdf
    • https://cdn-cms.f-static.net/uploads/4379959/normal_5f8c6583405db.pdf
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f8e6b71be7eb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0482/8794/0776/files/sukeluwufewuxojuzixarit.pdf
    • https://cdn.shopify.com/s/files/1/0500/1501/0976/files/pegisowetoj.pdf
    • https://cdn.shopify.com/s/files/1/0484/6845/9681/files/what_is_muster_duty_in_the_navy.pdf
    • https://s3.amazonaws.com/mijedusovineti/62692535614.pdf
    • https://s3.amazonaws.com/tetazino/89238721230.pdf
    • https://s3.amazonaws.com/zirojopemup/kajal.pdf
    • https://s3.amazonaws.com/mijedusovineti/tigamel.pdf
    • https://uploads.strikinglycdn.com/files/8e125ca8-ccff-484f-bc66-56cefc361394/88697637791.pdf
    • https://uploads.strikinglycdn.com/files/c269d9ac-b3d9-4a1d-b538-bfdbb0c5a6d9/62237070341.pdf
    • https://uploads.strikinglycdn.com/files/eebb06de-043b-46f9-9d15-339359f4b47e/defek.pdf
    • https://s3.amazonaws.com/gupuso/difference_between_nationalism_and_patriotism.pdf
    • https://s3.amazonaws.com/subud/grb_organic_chemistry_for_neet_download.pdf
    • https://s3.amazonaws.com/susopuzupure/blue_water_grill_menu.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_off0000748b.bin
d8de5cf956d152e63fb14e30859e989cca0298240adc23c685a077ed6b3a63ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x748B 5376 bytes
font_01_sfnt_off000086ba.bin
e23b3e8d03bd482d8c6836cd2eb5f6bfb40ba8ca5eff2e7841bba0cfcf4fa5ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x86BA 13624 bytes