Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a2a9b75185426fc…

MALICIOUS

PDF

43.8 KB Created: 2020-10-27 02:58:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7a9107aa3047a5b967c209a57a330aaf SHA-1: 799b24fa18574c1ced39216e24922df09e5551cb SHA-256: 9a2a9b75185426fcce8906dd50539a38a4de9d3ff18cf162f2ed3d4b4aad0db3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links pointing to various PDF files hosted on external sites, forming a link farm. One of the primary links, 'https://ggtraff.ru/strik?keyword=breaking+ground+property+management+nyc', is identified as a malicious redirector, suggesting the document's purpose is to direct users to malicious 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://ggtraff.ru/strik?keyword=breaking+ground+property+management+nyc
    • https://cdn-cms.f-static.net/uploads/4366045/normal_5f86f8be53ad1.pdf
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f870e0778107.pdf
    • https://cdn-cms.f-static.net/uploads/4393183/normal_5f9757236171e.pdf
    • https://dejolezeg.weebly.com/uploads/1/3/2/8/132815968/1423781.pdf
    • https://togitarusufojir.weebly.com/uploads/1/3/2/6/132681229/remoxozekefivav_nokifoma_gibidogujaxe_welebotasas.pdf
    • https://valoxapemep.weebly.com/uploads/1/3/4/3/134305175/kijilakajajamo_labovoponibeg.pdf
    • https://lupolaluxu.weebly.com/uploads/1/3/2/6/132681144/f320f.pdf
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/kovunikol.pdf
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/959063.pdf
    • https://tisatazufewuvo.weebly.com/uploads/1/3/1/1/131163687/85312e9ef6.pdf
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/zaxaratarafoxiw.pdf
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/1482248.pdf
    • https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/gurokilepipujo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tifuwuw/luruzezefirevesano.pdf
    • https://s3.amazonaws.com/fifomi/75614717029.pdf
    • https://cdn.shopify.com/s/files/1/0486/2931/7790/files/does_hdmi_carry_analog_audio.pdf
    • https://cdn.shopify.com/s/files/1/0468/1151/2986/files/lee_sang_wook.pdf
    • https://cdn.shopify.com/s/files/1/0481/7292/5095/files/android_apk_signing_v2.pdf
    • https://cdn.shopify.com/s/files/1/0502/9439/0966/files/vozuwimo.pdf
    • https://cdn.shopify.com/s/files/1/0498/0300/2019/files/youll_be_back_lyrics_hamilton_musical.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_off00006bf0.bin
0cb80340f9d2d80331a9e66f04dee223102d57f55f05cc7d19a725323b1ae611		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BF0 5396 bytes
font_01_sfnt_off00007e3e.bin
55bf604f3557cc7e66ec3f953d943f8088cb3f9b9660e9e0a80d0b76f4e299a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E3E 10248 bytes

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