Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae9c4363aca64bb9…

MALICIOUS

PDF

42.3 KB Created: 2020-11-04 18:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a73bb5aacdad9ec522850c62f0adf7f5 SHA-1: d5be512584a4999756177c4b3789eb3a6cf6eb77 SHA-256: ae9c4363aca64bb9f7c3cd315d504afd7cf11fbc3550e4a6fc903b4a35181a27
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded links, with at least one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is https://cctraff.ru/123?keyword=the+republican+era, which likely serves as a gateway to further malicious content. The presence of numerous other PDF links suggests a link farm or redirection strategy.

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://cctraff.ru/123?keyword=the+republican+era
    • https://tebamebameden.weebly.com/uploads/1/3/3/9/133997375/fizowemage.pdf
    • https://mimoberojatef.weebly.com/uploads/1/3/4/3/134316463/8344901.pdf
    • https://cdn-cms.f-static.net/uploads/4417530/normal_5fa1a3da156de.pdf
    • https://cdn-cms.f-static.net/uploads/4393020/normal_5fa254ec44fef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/bokelur/carefree_boat_club_cost_dc.pdf
    • https://uploads.strikinglycdn.com/files/3751dca1-7d2a-44b9-a1ce-05cc82fb2e4c/32404286545.pdf
    • https://s3.amazonaws.com/viromibukoleliw/kinuzenejogawenijilaw.pdf
    • https://s3.amazonaws.com/divelatoxa/biology_in_hindi_for_railway.pdf
    • https://s3.amazonaws.com/luropi/yadah_tv_live_streaming.pdf
    • https://s3.amazonaws.com/gupuso/60051742155.pdf
    • https://uploads.strikinglycdn.com/files/f16d3cd8-fe6d-4ff5-8dca-f873083dbc42/30445669318.pdf
    • https://s3.amazonaws.com/punagilelabon/nepukewelurazanube.pdf
    • https://uploads.strikinglycdn.com/files/14f4e209-d6eb-464f-8261-dfce60bc2b10/mujolesomepomitasepe.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c87.bin
d850408dd164ea043cdae92e2e39452d8d93352b4eae933b529099f58f9c9f0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C87 4624 bytes
font_01_sfnt_off00006c19.bin
7f77193d22eab267fc9347ce2776491b2495b36314221c44e44ed0e8863a8d31
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C19 10152 bytes
font_02_sfnt_off00008eb5.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB5 4324 bytes