Malicious PDF — malware analysis report

Static analysis result for SHA-256 95a646789eae7b02…

MALICIOUS

PDF

51.3 KB Created: 2020-10-29 04:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fcba3dc6212a7962f3e4321efa8a5905 SHA-1: 7387b6e7fc40d45d3aad053c7420445bdf196809 SHA-256: 95a646789eae7b02757c88560ea2c8769d01c3b347830a8b8087c5cccd1fe45b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or link farms, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. One of the primary links directs to 'https://ttraff.cc/123?keyword=materiales+didacticos+psicologia+del+aprendizaje', which is flagged as malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness.

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://ttraff.cc/123?keyword=materiales+didacticos+psicologia+del+aprendizaje
    • https://cdn-cms.f-static.net/uploads/4419645/normal_5f9a06b0d19ad.pdf
    • https://cdn-cms.f-static.net/uploads/4368768/normal_5f8a9a0691016.pdf
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5f908ef30767b.pdf
    • https://tejigenunonim.weebly.com/uploads/1/3/0/8/130813632/texil.pdf
    • https://cdn-cms.f-static.net/uploads/4381347/normal_5f93d6cc13356.pdf
    • https://tasozowi.weebly.com/uploads/1/3/4/3/134315408/a644cdfcfc.pdf
    • https://gejovekozeja.weebly.com/uploads/1/3/4/4/134401956/7fccbc.pdf
    • https://cdn-cms.f-static.net/uploads/4368751/normal_5f8943ee6745e.pdf
    • https://menelaxewo.weebly.com/uploads/1/3/4/3/134362368/2318081.pdf
    • https://sapakokejepudig.weebly.com/uploads/1/3/4/4/134457578/4692693.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/91b5b1f3-ae17-472c-a486-cd1d4e5c1504/33678019718.pdf
    • https://s3.amazonaws.com/fonazuzixagizir/converting_liquid_measurements_worksheets.pdf
    • https://s3.amazonaws.com/kavitokolezub/tatakosokuvexobofemorate.pdf
    • https://s3.amazonaws.com/bofake/bacteria_gram_stain.pdf
    • https://s3.amazonaws.com/sugowubuf/second_conditional_exercises_british_council.pdf
    • https://uploads.strikinglycdn.com/files/b494dc33-297c-4215-814a-8506c0ab0de4/24038023054.pdf
    • https://s3.amazonaws.com/leguvefu/andhra_pradesh_rivers_and_dams_map.pdf
    • https://s3.amazonaws.com/purawuma/buxilosesez.pdf
    • https://uploads.strikinglycdn.com/files/cdf89f23-85ef-4479-a7c0-2fb1161fdd51/51531260255.pdf
    • https://s3.amazonaws.com/fasanag/61162502025.pdf
    • https://s3.amazonaws.com/jobavo/ikea_metal_bunk_bed_instruction_manual.pdf
    • https://uploads.strikinglycdn.com/files/3fa71c6e-9968-47e8-b2af-017657e91b7a/vadilumewuzatamixula.pdf
    • https://uploads.strikinglycdn.com/files/28942dfd-d6b9-4bb4-bac4-985b094b17f8/boponobepopawisafatose.pdf
    • https://s3.amazonaws.com/dorobukasawituw/28413150845.pdf
    • https://s3.amazonaws.com/leguvefu/13870306682.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_off00007b4c.bin
fa30b200f6af8ee272e0354f7be000e3caa7253266f2aa678f73e3193bd562fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4C 5160 bytes
font_01_sfnt_off00008cf1.bin
0fcf2695f84331faaab39691b05225a88ee3669b6cd5aa129b0452cbfec148df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF1 10608 bytes
font_02_sfnt_off0000af74.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF74 4324 bytes

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