Malicious PDF — malware analysis report

Static analysis result for SHA-256 82372f1eff43434d…

MALICIOUS

PDF

53.5 KB Created: 2020-08-09 03:26:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4e347bbbb5f1a6d76322727e61ec134 SHA-1: 7a3305e8d0eb29807b674c92803424b118e9fd6d SHA-256: 82372f1eff43434d7de790686686bedabb847803088dcd580cec0b91d1967214
194 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external PDF files, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.com/pify?keyword=third+world+countries+meaning+pdf. The document body, though heavily obfuscated, contains text related to 'third world countries meaning pdf' and references wkhtmltopdf, indicating a potential lure. The presence of multiple PDF links and a malicious redirector strongly suggests an attempt to lead the user to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.com/pify?keyword=third+world+countries+meaning+pdf
    • http://bubow.annetrauben.com/uploads/1/3/0/8/130814017/vagel.pdf
    • http://files.westernmontanalittleguywrestling.com/uploads/1/3/1/3/131382092/6424065.pdf
    • http://files.shadleparkband.org/uploads/1/3/1/3/131379353/sataxupavimanolajo.pdf
    • http://files.fishersville-umc.org/uploads/1/3/0/7/130776644/1144806.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0437/5491/3943/files/41587542176.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/labeluwoze.pdf
    • https://cdn.shopify.com/s/files/1/0438/9906/0376/files/65821659397.pdf
    • https://cdn.shopify.com/s/files/1/0436/9845/4682/files/verobusujijuse.pdf
    • https://cdn.shopify.com/s/files/1/0434/6403/2421/files/vogapesokaxefe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/24631743978.pdf
    • https://cdn.shopify.com/s/files/1/0430/0134/8255/files/nusosiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/2087/0044/files/21028750155.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wurawosupamajo.pdf
    • https://cdn.shopify.com/s/files/1/0431/5840/5275/files/raborako.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008552.bin
07abfb64cc71ee3290fffa0c20a8ed9c37f55126adf905be598bbb37508fb237		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8552 5492 bytes
font_01_sfnt_off000097de.bin
42d068fd44fa4eb8efc07abddd909c2b5186e092adaa0d3b6bb7443e1f7c2f95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97DE 10284 bytes
font_02_sfnt_off0000baec.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAEC 4324 bytes

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