Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc7568ddb93dcf1…

MALICIOUS

PDF

41.2 KB Created: 2020-10-26 20:59:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8af67214670c9cd2004351a344a6de2 SHA-1: 77ad030837fe8ddccc1dd3ff2912131771ae1b7b SHA-256: 1bc7568ddb93dcf13f354da20c304203a55be622a72c026f7391122daa69a50e
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to external resources, with one critical link identified as a malicious redirector. The ML classifier strongly indicated maliciousness, and the document body, though obfuscated, contains the redirector URL. This suggests the PDF is designed to redirect users to malicious infrastructure, likely for further exploitation or phishing.

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=molarity+worksheet+1
    • https://folarudivol.weebly.com/uploads/1/3/1/8/131871739/959b581.pdf
    • https://cdn-cms.f-static.net/uploads/4369656/normal_5f95fffa4e4ca.pdf
    • https://cdn-cms.f-static.net/uploads/4384296/normal_5f90f1f63f0bf.pdf
    • https://cdn-cms.f-static.net/uploads/4388824/normal_5f926c9157c2e.pdf
    • https://cdn-cms.f-static.net/uploads/4367640/normal_5f88494a048cd.pdf
    • https://laxuruvu.weebly.com/uploads/1/3/1/4/131482832/patav_naximobim_selemarokil.pdf
    • https://fijefozumomaba.weebly.com/uploads/1/3/4/4/134491855/9319785.pdf
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/cb89488.pdf
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/271339.pdf
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/2861703.pdf
    • https://cdn-cms.f-static.net/uploads/4367290/normal_5f94839444ed1.pdf
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f8ae78d670e5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/henghuili-files2/anthropogenic_hazards.pdf
    • https://s3.amazonaws.com/vutame/bangladesh_passport_form_fill_up_sample_download.pdf
    • https://s3.amazonaws.com/sizadagazagaj/12690678385.pdf
    • https://uploads.strikinglycdn.com/files/fb75f647-f2c7-4a0d-9425-93a5cf45ce53/buroporunikibujikufi.pdf
    • https://uploads.strikinglycdn.com/files/bddd0305-294d-4063-a41a-74eebd463083/derorixemalaxepavakes.pdf
    • https://uploads.strikinglycdn.com/files/12ee7f7e-d051-4557-bf9e-ab7bec3ca481/nufuxanavi.pdf
    • https://uploads.strikinglycdn.com/files/efc3a0cd-7651-4656-a3f7-7f110e31a2fd/voxadubekezo.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_off000062f3.bin
1e9d5489eda7b2261fa24397a27c3f0edb432432b4135cd424e68ac61bf06c48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F3 5088 bytes
font_01_sfnt_off0000745b.bin
3acffd4d3e20121d79389defea322db7cc69c912d9a22a2f8699c0653fd7247d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x745B 10524 bytes

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