Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd371c9cd0728f0…

MALICIOUS

PDF

77.2 KB Created: 2020-11-24 19:35:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4f332238950bac1fccccf2e35adba81 SHA-1: d66ac919738dfc2909566b4701d74530c0e6fb67 SHA-256: 7cd371c9cd0728f0713e7b62e4f6710b97ca7353ee6b6f96b0fb4701b261fd61
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with critical heuristics indicating it's a redirector and a link farm. One of the primary links points to known malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is weaponized.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/strik?utm_term=death+the+kid+cosplay
    • https://vofixerexelisat.weebly.com/uploads/1/3/4/3/134311693/mokalinoneko.pdf
    • https://cdn-cms.f-static.net/uploads/4367304/normal_5f875a74b7ce5.pdf
    • https://cdn-cms.f-static.net/uploads/4427793/normal_5f9b78fcaa7cb.pdf
    • https://cdn-cms.f-static.net/uploads/4369311/normal_5f8a64ae4c79d.pdf
    • https://cdn-cms.f-static.net/uploads/4459034/normal_5fb9a57c8bc89.pdf
    • https://cdn-cms.f-static.net/uploads/4416319/normal_5f9509a2a5ded.pdf
    • https://cdn-cms.f-static.net/uploads/4408997/normal_5fa0fd33330fe.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/godoremitiwuja/among_us_game_online_free_play.pdf
    • https://uploads.strikinglycdn.com/files/1904ada9-a996-453d-a724-e2e4568aa1f4/77849587448.pdf
    • https://s3.amazonaws.com/vukumesoj/agriculture_census_2019.pdf
    • https://s3.amazonaws.com/wizuluworafid/equidad_de_genero_laboral.pdf
    • https://s3.amazonaws.com/woxotopapozokev/the_grove_coffee_shop_gilbert.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://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000dc89.bin
15da05b54cc5c31faf6395e8d2d031667da835c9f03026cdb88416298477bb72		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDC89 13652 bytes
font_00_sfnt_off0000cabb.bin
eb7d3274d1e69ddd2a93f27ddbaab5195b49078da5364c6cf4eedf700ac31b20		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCABB 5228 bytes
font_02_sfnt_off00010265.bin
2ef04285f66f1cba90a14c9c1ef3522f52e76a765ffef920acfeb5b8c0305d8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 10800 bytes

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