Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d97834a8aeb165…

MALICIOUS

PDF

40.2 KB Created: 2020-11-09 09:59:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cab3cae64ea7497e94f22f438f61b269 SHA-1: ee621e6f4c1b5b678d21b2f13d558a1814572956 SHA-256: 73d97834a8aeb165b7c8d747395980aa541bd0ac4c3809f1a3f88dd24ae35e26
124 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, includes the URL 'https://ggtraff.ru/wb?keyword=midsegment%20of%20a%20triangle%20worksheet', which is flagged as malicious. The presence of multiple links hosted on disposable domains further supports the malicious intent, likely to lead users to phishing or malware distribution sites.

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 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/wb?keyword=midsegment%20of%20a%20triangle%20worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387419/normal_5f8e60c7102e3.pdfIn PDF document text
    • https://rakamukomegu.weebly.com/uploads/1/3/2/6/132681656/bijawixevibo-metamosukes-jekulukiz-tesoromiwi.pdfIn PDF document text
    • https://kudumegowejo.weebly.com/uploads/1/3/4/2/134266354/1926327.pdfIn PDF document text
    • https://sudigosapo.weebly.com/uploads/1/3/4/4/134456465/7142456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_5f8d6b6647253.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392666/normal_5f98322e3e5c6.pdfIn PDF document text
    • https://fiwixenolo.weebly.com/uploads/1/3/4/4/134493020/9fa48bf6992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452161/normal_5fa24260d4640.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f871bcb6d4c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/df110584-0db2-4480-8703-c3212a680c62/fabolo.pdfIn PDF document text
    • https://vadazigifexe.files.wordpress.com/2020/11/merozasopegujibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df2811ec-6e00-4530-aa21-4ff0dbeb1f82/9325910704.pdfIn PDF document text
    • https://padapifizi.files.wordpress.com/2020/11/8002124931.pdfIn PDF document text
    • https://fajutavezuku.files.wordpress.com/2020/11/96485473658.pdfIn PDF document text
    • https://kixatipu.files.wordpress.com/2020/11/ap_calc_bc_2018_frq_answers.pdfIn PDF document text
    • https://tilazemiro.files.wordpress.com/2020/11/baresuvadumijuz.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/fojepugewevufipufomu.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B29 5480 bytes
SHA-256: 19137df2cf3d626d545b8a3dc526ca9e420666057b89d406c431e7f3292bbd1f
font_01_sfnt_off00006dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DBF 11240 bytes
SHA-256: fa2732b9695b6741399052abcbd19801c8ca84aafea9d95fb6bfb76483202027

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