Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4cc2a6a3bb2e128…

MALICIOUS

PDF

39.6 KB Created: 2020-11-01 02:44:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5895b6687703b6cdf081ee0866dbeeaf SHA-1: 756783481602d7b62d5524b1795a3a5d0c9519a5 SHA-256: d4cc2a6a3bb2e1284ba841921617335792c0a860ae985ff00737a5a30711ad36
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting services or known malicious redirectors. The ML classifier strongly indicated maliciousness, and heuristics identified it as a link farm designed to redirect users. The primary malicious URL identified is https://ggtraff.ru/aws?keyword=plant+cell+coloring+sheet+answer+key.pdf, which is also flagged as a redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/aws?keyword=plant+cell+coloring+sheet+answer+key.pdf In PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/665612.pdfIn PDF document text
    • https://vabisoxapulaji.weebly.com/uploads/1/3/4/4/134444495/zafiteredot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388839/normal_5f9426e2b7095.pdfIn PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/luziguzipopujimobaz.pdfIn PDF document text
    • https://sawalodisixujig.weebly.com/uploads/1/3/4/4/134490012/gilibopanev-genutitigif-gejega.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389394/normal_5f96c5b342e8d.pdfIn PDF document text
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/0a845cbc6d4e.pdfIn PDF document text
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/tokep.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/juxaxapenavo.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/the_egg_story_reincarnation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/4087/9777/files/90297641930.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8076/2023/files/98900454231.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0504/9932/2011/files/98588415025.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/5001/4115/files/mount_and_blade_warband_swadian_man_at_arms.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8462/7616/files/desmume_free_download_for_android.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5043 3016 bytes
SHA-256: 1029df7fe439618366435259930880b1383516b6f39c8995429e503ccdd2fdd9
font_01_sfnt_off00005b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B08 5708 bytes
SHA-256: 821ee385e804a6c2de3684b9cec3b76cdf0a27b4f0cb915f29e9c37643499c56
font_02_sfnt_off00006e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6E92 10076 bytes
SHA-256: 460ee1eaebdfe1cfc22de8e37f0cda4596d9fa6155dfd1bdbd2c3d7518e5e09a

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