Malicious PDF — malware analysis report

Static analysis result for SHA-256 48c5093d8ef32f43…

MALICIOUS

PDF

49.5 KB Created: 2020-10-26 23:54:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ddce42ec4a0a902ebde68a18e1e31d4 SHA-1: 188e87d87390d73db95eaa9a96e5001508097f80 SHA-256: 48c5093d8ef32f43f79f21cf8929348ccb58ae43d3a994eb0145800a4be8cad2
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure or link farms. The document body, though partially obfuscated, contains a URL that is also present in the heuristics, indicating a deliberate attempt to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed for malicious redirection.

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.link/pify?keyword=maximum+charge+on+a+capacitor+rc+circuit
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/biwosixuxagexukaxa.pdf
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/dinipufo_pomupizutib.pdf
    • https://givifajilodox.weebly.com/uploads/1/3/0/8/130874655/06d42e8b5bcad.pdf
    • https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/wuwibodad_reroraja_vilumubivemulif_kapedob.pdf
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/3417563.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5308/0991/files/wotolizirobiratalukoro.pdf
    • https://cdn.shopify.com/s/files/1/0496/0724/5976/files/android_disable_developer_mode.pdf
    • https://cdn.shopify.com/s/files/1/0432/5025/3984/files/kagavimopubanomevet.pdf
    • https://cdn.shopify.com/s/files/1/0434/5790/4792/files/tiviruka.pdf
    • https://cdn.shopify.com/s/files/1/0482/4406/4408/files/kugane_castle_tank_guide.pdf
    • https://cdn.shopify.com/s/files/1/0495/7385/5388/files/melissa_and_doug_magic_set_directions.pdf
    • https://cdn.shopify.com/s/files/1/0468/8786/2429/files/wigumefo.pdf
    • https://cdn.shopify.com/s/files/1/0503/1087/3273/files/best_tower_defense_2020_android.pdf
    • https://uploads.strikinglycdn.com/files/6db9f841-87b4-405f-a407-5187ab79c4bd/colocacion_de_sonda_endopleural.pdf
    • https://uploads.strikinglycdn.com/files/188a4032-164f-4c94-a614-f711c21ff844/47714319576.pdf
    • https://uploads.strikinglycdn.com/files/77e9f8a6-14ca-4725-be0f-94f860209994/81370618637.pdf
    • https://uploads.strikinglycdn.com/files/3eed3c2a-253a-49b7-84ed-c57ec31f946f/3213101232.pdf
    • https://uploads.strikinglycdn.com/files/0b909f6e-ca93-4292-be03-cb32f13c2cf3/45425460936.pdf
    • https://cdn.shopify.com/s/files/1/0436/6496/5782/files/dalapudumotelemolalene.pdf
    • https://cdn.shopify.com/s/files/1/0430/4578/1658/files/wejegivuka.pdf
    • https://cdn.shopify.com/s/files/1/0431/5391/6060/files/22485186582.pdf
    • https://cdn.shopify.com/s/files/1/0494/5841/3735/files/wesagewakasupu.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_off00007dac.bin
35be5b51ddd969558c1ea688d004028123502adbf5d6628a65d046b988f1128a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DAC 5212 bytes
font_01_sfnt_off00008f46.bin
f38bac6c342f78675082c18464dcbc625a55fbfc124c31ec3e08ac71b5d6bca6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F46 12144 bytes

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