Malicious PDF — malware analysis report

Static analysis result for SHA-256 35104fdbe9378efb…

MALICIOUS

PDF

48.5 KB Created: 2020-10-28 16:03:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 751525adc3c3a002acf31db14e2087b9 SHA-1: 7a02482389ab1ecd534984e9d86872878ac8105b SHA-256: 35104fdbe9378efb996a0ce96e277de77ea6c1f69fb571e33203096252bc21a6
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, with at least one identified as a malicious redirector and another as part of a link farm. The document body, though heavily obfuscated, also contains URLs that appear to be part of this link farm. This suggests the primary purpose is to drive traffic to malicious or SEO-manipulated sites, potentially as a precursor to phishing or malware distribution.

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://cctraff.ru/strik?keyword=bumble+and+bumble+invisible+oil+mask
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/sonur_fafos.pdf
    • https://fixabugodorev.weebly.com/uploads/1/3/1/8/131856934/1948144.pdf
    • https://cdn-cms.f-static.net/uploads/4368466/normal_5f98e2b501da7.pdf
    • https://cdn-cms.f-static.net/uploads/4365612/normal_5f87096af03bc.pdf
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5f92692fddeec.pdf
    • https://galojegada.weebly.com/uploads/1/3/4/3/134364802/7253501.pdf
    • https://cdn-cms.f-static.net/uploads/4392658/normal_5f9074bce38fe.pdf
    • https://bizitodavil.weebly.com/uploads/1/3/4/3/134321392/derixagirawade-fukofidazizegud-jezukuxinokegux.pdf
    • https://suganolorifumu.weebly.com/uploads/1/3/0/8/130814011/bc71e621f30cf1.pdf
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/07466540.pdf
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/sezezojoroj-vijazuxopabu.pdf
    • https://nurirekesuvakip.weebly.com/uploads/1/3/4/4/134404885/dezonexuxu_bisowe.pdf
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5f94ceb6c6c84.pdf
    • https://gozuneputir.weebly.com/uploads/1/3/4/3/134345179/kuwifuma_ropemimogekovak_xosugu_wedufe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f29b73c5-9c0e-4826-b38a-b8ab547e2cb3/79199139181.pdf
    • https://s3.amazonaws.com/luxelula/najim.pdf
    • https://uploads.strikinglycdn.com/files/edc2adfb-ba24-4fe8-9477-42ec97e8aede/numogugok.pdf
    • https://s3.amazonaws.com/vekodupiwarobi/mejuvuwewawitimod.pdf
    • https://uploads.strikinglycdn.com/files/332a8db3-797a-41e0-95fa-c62fd5f78b07/52558615690.pdf
    • https://uploads.strikinglycdn.com/files/a681846e-2b8b-4629-832e-0a23a54acd42/94187666453.pdf
    • https://uploads.strikinglycdn.com/files/60293a77-52f0-4606-bdb4-73c176c21909/95474143213.pdf
    • https://uploads.strikinglycdn.com/files/14ace8a1-e9b6-46da-ac00-3216cc3c4b14/bomelamuvitomeza.pdf
    • https://uploads.strikinglycdn.com/files/2366139d-e769-494f-9a99-2fb5545726df/clarinet_excerpts_book.pdf
    • https://uploads.strikinglycdn.com/files/892413ce-dc4e-478d-b6a5-642cf5231a39/dbz_shin_budokai_2_save_data.pdf
    • https://uploads.strikinglycdn.com/files/4c9d440d-fb0b-4ba8-a239-872a52ca76d3/xilobugasiluzoxuku.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_off00007cb4.bin
3f9510a50326f6218bb07197c472cf220439f925a468e14b44e4d18058697a90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB4 5188 bytes
font_01_sfnt_off00008e4a.bin
4deeec5e10ce5ffda8d72500d9041c60a2ca9a2dba480366d0cea4163bbf365d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E4A 11212 bytes

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