Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc0b6a4428afec9c…

MALICIOUS

PDF

43.0 KB Created: 2020-10-27 09:30:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9dbf7ade7ca6dc2735a46a3fcf96b743 SHA-1: 73d477d734af6061a1777114545a99c989546852 SHA-256: dc0b6a4428afec9c57e1beaa5453d58c602a56f590add05dbb12ef5ed8f6bb5f
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirector infrastructure and link farms. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, potentially for 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=walter+stewart+library+hours
    • https://gogebuzavoriro.weebly.com/uploads/1/3/2/6/132681212/pagerujujorik.pdf
    • https://detosujedeke.weebly.com/uploads/1/3/4/3/134371576/kusefota.pdf
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/gipug_xuvuzipufiwipob_fafilu.pdf
    • https://vuxozajuje.weebly.com/uploads/1/3/1/3/131379873/dozafawegikuxoto.pdf
    • https://daxuregivav.weebly.com/uploads/1/3/4/4/134431970/kowiburujoleja.pdf
    • https://nubojubixuxo.weebly.com/uploads/1/3/1/4/131410311/394504747c9d32.pdf
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/bukokamuguxat_jiweruzu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6989/8909/files/55105443023.pdf
    • https://cdn.shopify.com/s/files/1/0497/5172/0090/files/willie_lynch_syndrome_today.pdf
    • https://cdn.shopify.com/s/files/1/0478/1791/6575/files/97345522290.pdf
    • https://cdn.shopify.com/s/files/1/0499/8361/9232/files/sipuf.pdf
    • https://cdn.shopify.com/s/files/1/0499/8837/0582/files/pisezokemirefaganibopaja.pdf
    • https://cdn.shopify.com/s/files/1/0499/3826/8318/files/walking_dead_episode_guide_season_4.pdf
    • https://cdn.shopify.com/s/files/1/0504/8238/0965/files/62020414419.pdf
    • https://cdn.shopify.com/s/files/1/0433/7333/0593/files/kwikset_smart_lock_910_instructions.pdf
    • https://uploads.strikinglycdn.com/files/32dfe7d6-7c73-4bae-92e7-e57867ea5c96/71930358508.pdf
    • https://uploads.strikinglycdn.com/files/21f76730-f119-4d69-b707-564a49dde6b0/god_of_war_chains_of_olympus_ppsspp.pdf
    • https://uploads.strikinglycdn.com/files/f0c5351a-370e-4688-8883-5e2ca0b4140f/rilut.pdf
    • https://uploads.strikinglycdn.com/files/dd3104f1-d3f7-4127-8554-98c6a327d7d2/bblia_septuaginta_online_em_portugues.pdf
    • https://uploads.strikinglycdn.com/files/30656404-0948-43bc-9a2b-60b9b7b1cbcf/stihl_ms193t_service_manual.pdf
    • https://uploads.strikinglycdn.com/files/d0d13e49-52a7-4f22-abd1-0e37985df266/nunebitukesezuxokelegijuk.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_off00006a37.bin
dd556f598e91240893c318738e0556a2f6ae78376b5a7c702f096935b12afaaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A37 5120 bytes
font_01_sfnt_off00007bae.bin
8cdc619ffd7757bf26d7aeb1dbd5d50efaa350f3f11a1628aa97a5dced4baf28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BAE 10416 bytes

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