Malicious PDF — malware analysis report

Static analysis result for SHA-256 4194438c31a8ccff…

MALICIOUS

PDF

58.6 KB Created: 2020-10-20 13:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e57f5250c466ef089aee13a462a9448b SHA-1: 9e5e3e15852d99f70bfa3844d25105beb55f2002 SHA-256: 4194438c31a8ccffee35d6b74cf582f0695984633c601b036c3ebd923cf4f14c
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external resources, suggesting a link farm or redirection strategy. One prominent link, 'https://cctraff.ru/123?keyword=doom+3+download+android', is flagged as malicious and likely serves as the primary lure. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent, likely to redirect users to a compromised site for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://cctraff.ru/123?keyword=doom+3+download+android
    • https://cdn-cms.f-static.net/uploads/4366385/normal_5f8ac87d08cba.pdf
    • https://cdn-cms.f-static.net/uploads/4369762/normal_5f89e49fec79d.pdf
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f874875a3b01.pdf
    • https://cdn-cms.f-static.net/uploads/4367951/normal_5f8904383d258.pdf
    • https://cdn-cms.f-static.net/uploads/4372681/normal_5f8bc77580d87.pdf
    • https://cdn-cms.f-static.net/uploads/4371791/normal_5f89796031c5d.pdf
    • https://cdn-cms.f-static.net/uploads/4365552/normal_5f86f972c45d5.pdf
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f8715e487cb1.pdf
    • https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/vatuwof.pdf
    • https://sixapinipuso.weebly.com/uploads/1/3/1/3/131384402/5865603.pdf
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/tunitulo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://www.fontrix.comhttp://www.nhncorp.com
    • https://cdn.shopify.com/s/files/1/0484/0639/7096/files/gudugipigu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4584/6168/files/ice_chest_with_wheels.pdf
    • https://cdn.shopify.com/s/files/1/0498/0952/2845/files/auto_backup_files_to_google_drive_android.pdf
    • https://cdn.shopify.com/s/files/1/0497/8452/0853/files/xosenulisujegixu.pdf
    • https://cdn.shopify.com/s/files/1/0502/1886/0729/files/59137502345.pdf
    • https://uploads.strikinglycdn.com/files/948bedb4-56c8-4ebb-9fcc-53b781a5f2ec/697723140.pdf
    • https://uploads.strikinglycdn.com/files/a56a308c-185c-4d8b-9901-a7e3b603d316/bipifurapuwi.pdf
    • https://uploads.strikinglycdn.com/files/8c7a155c-3e16-4977-b54c-642f067bdc41/nokia_e71.pdf
    • https://uploads.strikinglycdn.com/files/38165125-8a0b-4716-9b6b-df7469aeed85/24285523466.pdf
    • https://uploads.strikinglycdn.com/files/912756cc-afee-4183-aea7-f15b772c1834/how_to_play_jonny_b_goode.pdf
    • https://uploads.strikinglycdn.com/files/2c3ae5d4-7529-4484-a789-bd0858588666/39238971951.pdf
    • https://uploads.strikinglycdn.com/files/5f281932-014b-46c3-8dfb-793e754a186c/salatojozepexoxuramuzaw.pdf
    • https://uploads.strikinglycdn.com/files/860bec08-fda8-4fe6-8a2f-26d399146ac3/5184180818.pdf
    • https://uploads.strikinglycdn.com/files/d7cbbc43-0a51-4fd5-b3a7-865abe17cae8/pigibixodijogewudexures.pdf
    • https://uploads.strikinglycdn.com/files/a07df253-df43-4358-b7c5-9bb21e2ec771/zatoxumugafamisob.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
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008276.bin
03b7113eed2bc3b65675810c12b9e52607c00fe5b7eaeeeee8164b8c45f76f3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x8276 5048 bytes
font_01_sfnt_off00009394.bin
e4d1b09b820020feedb0c2f938b6150901ba11c4536ca41312d65c78aa76855d
pdf-font-stream PDF embedded font (sfnt) at offset 0x9394 8876 bytes
font_02_sfnt_off0000ac6a.bin
2dcc61dc99bb4a5b66c2cf644c050493e3372b70c330c5a5387007a68f73d044
pdf-font-stream PDF embedded font (sfnt) at offset 0xAC6A 9864 bytes
font_03_sfnt_off0000ce30.bin
13699fdcbd3c4052807498cf49f4644d68ce43426a1cb55379510d630bffe7d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCE30 2964 bytes