Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e7df5db298b856f…

MALICIOUS

PDF

50.7 KB Created: 2020-08-05 12:56:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db973035f040ae78cd27d59b5743c32d SHA-1: ed6b0cc1ab0765dd0b02701f482c954972b4057b SHA-256: 1e7df5db298b856ff8fee8a2b81dfb51d29433187f6940387baf7e1595db6c04
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to external PDF files, indicating a link farm or SEO poisoning attempt. One critical heuristic identified a link to a known malicious redirector at https://ttraff.cc/pify?keyword=bncc+ciencias+da+natureza+pdf, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains this URL and references to PDF files, reinforcing the lure.

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.cc/pify?keyword=bncc+ciencias+da+natureza+pdf
    • http://files.mrmichaelmccloskey.com/uploads/1/3/1/4/131437982/zanunulituxos_jidifevit.pdf
    • http://files.bookpod.com.au/uploads/1/3/0/7/130740624/lefarikad.pdf
    • http://gumerox.redbeautyco.com/uploads/1/3/1/6/131637309/255116.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/vafijuwexivuguk.pdf
    • https://cdn.shopify.com/s/files/1/0434/9883/2037/files/64683046767.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/2268944040.pdf
    • https://cdn.shopify.com/s/files/1/0429/7388/8671/files/16671483196.pdf
    • https://cdn.shopify.com/s/files/1/0431/7301/9808/files/86923836614.pdf
    • https://cdn.shopify.com/s/files/1/0427/8494/8380/files/nikesezaxetutavebubo.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/20633946460.pdf
    • https://cdn.shopify.com/s/files/1/0437/7736/0029/files/gizeni.pdf
    • https://cdn.shopify.com/s/files/1/0440/1122/5246/files/ordinal_numbers_1_100_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4536/files/tafejuxofalolikif.pdf
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/rakikejojekax.pdf
    • https://cdn.shopify.com/s/files/1/0440/5500/3286/files/jawivarikizara.pdf
    • https://cdn.shopify.com/s/files/1/0430/0144/6551/files/warframe_directx_admin.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c5c.bin
50a075139c7468691126ffba9aef5584946020e49b7bd7c2c039cf8fed9785ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C5C 4988 bytes
font_01_sfnt_off00008d5c.bin
9c5ff22d83a592fe70a68ac5012451023da6f5ce9e6a3b987d797f537ab5b7b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D5C 10096 bytes
font_02_sfnt_off0000af97.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF97 4324 bytes

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