Malicious PDF — malware analysis report

Static analysis result for SHA-256 83434f027c59e3f6…

MALICIOUS

PDF

49.8 KB Created: 2020-10-17 08:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a643128001d98f81c1c610b11a4fd87 SHA-1: 561aaddd7bf273b2660b3ba41713b1e54d789c5a SHA-256: 83434f027c59e3f60f141d1a4466c1cc4ac515aff40838f1678bb42ca108e8e0
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting it is a 'voter list', likely a lure to encourage clicks. The PDF_SEO_LINK_FARM heuristic indicates a large number of links, many pointing to Weebly-hosted PDFs, suggesting a link farm or content spamming operation. The ML_NYX_PDF_MALICIOUS heuristic further confirms the malicious nature of the PDF.

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.me/123?keyword=voter+list+assam+2020+pdf+baksa
    • https://mogezisatizate.weebly.com/uploads/1/3/0/7/130775403/basusutagutowewiz.pdf
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/4757354.pdf
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/1cd83.pdf
    • https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/sopabevixa.pdf
    • https://xumogimunosu.weebly.com/uploads/1/3/1/6/131607683/f454405.pdf
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f871535ec47b.pdf
    • https://cdn-cms.f-static.net/uploads/4366405/normal_5f87100b4c752.pdf
    • https://cdn-cms.f-static.net/uploads/4366351/normal_5f873dd029b4f.pdf
    • https://cdn-cms.f-static.net/uploads/4378175/normal_5f89edb7f1d61.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0496/7474/8057/files/bodyguard_manual_dynasty_warriors_4.pdf
    • https://cdn.shopify.com/s/files/1/0492/4181/7244/files/95771138604.pdf
    • https://cdn.shopify.com/s/files/1/0499/1837/8152/files/download_terminal_emulator_pro_apk.pdf
    • https://cdn.shopify.com/s/files/1/0496/8215/3629/files/things_fall_apart_shmoop_chapter_1.pdf
    • https://cdn.shopify.com/s/files/1/0498/2924/9179/files/teveka.pdf
    • https://uploads.strikinglycdn.com/files/e52f5d2f-8e03-441c-aef1-5a270da802b4/didubelas.pdf
    • https://uploads.strikinglycdn.com/files/376d1ce0-b63b-4fcc-af0a-a5e48e8a62b4/mezoduxurifosetuxevukudij.pdf
    • https://cdn.shopify.com/s/files/1/0436/6362/2297/files/55377006872.pdf
    • https://cdn.shopify.com/s/files/1/0462/3820/4053/files/26190776353.pdf
    • https://cdn.shopify.com/s/files/1/0502/4422/3131/files/final_fantasy_tactics_2.1.0_apk.pdf
    • https://cdn.shopify.com/s/files/1/0498/4940/1499/files/keselega.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_off00008423.bin
4398262cd19c9ba74493bf99c1457914fb726121a209d098ad853ef47fa98377		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8423 5632 bytes
font_01_sfnt_off00009732.bin
a4c2155a52bf09fcaf2eecb1e9c2ddb7050ca9d5ff238c4fa393269b63ddf828		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9732 10096 bytes

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