Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ef7d0b9a3b0934…

MALICIOUS

PDF

71.7 KB Created: 2020-08-05 04:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c824436b87cfc4b768f5e55dacdb6826 SHA-1: add0027d99f456dc025fcba5c29e2328781622cf SHA-256: 83ef7d0b9a3b09347d3d426609e380c55e4e3f01986a5908dbc810081a082fb3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=argumentation+theory+pdf'. This link is presented within the document body, likely intended to trick the user into clicking it. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

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=argumentation+theory+pdf
    • http://files.geomarketingsolutions.com/uploads/1/3/1/8/131857305/5207274.pdf
    • http://files.aelc.org/uploads/1/3/2/6/132680822/repibusaxifa.pdf
    • http://files.spyderman.com/uploads/1/3/1/4/131438823/bibijuk.pdf
    • http://files.futurizeyourself.com/uploads/1/3/1/3/131381363/143601.pdf
    • https://cdn.shopify.com/s/files/1/0435/9775/8622/files/business_analyst_job_description.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2500557594.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/scp_containment_breach_mods.pdf
    • https://cdn.shopify.com/s/files/1/0431/4831/2736/files/pitorefivoralit.pdf
    • https://cdn.shopify.com/s/files/1/0439/5037/5070/files/libabuvevedejij.pdf
    • https://cdn.shopify.com/s/files/1/0437/4121/6917/files/lilavasabarujopizukisev.pdf
    • https://cdn.shopify.com/s/files/1/0429/8014/7359/files/convert_jpg_to_vector_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/6547/5226/files/77842054428.pdf
    • https://cdn.shopify.com/s/files/1/0429/1795/3702/files/kiwubekijopalipe.pdf
    • https://cdn.shopify.com/s/files/1/0436/5778/9605/files/witira.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/jomotofefapevipexef.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/prebles_artforms_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/5581/6599/files/pedejifebu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6374/6466/files/81030526973.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db62.bin
e1be6ef0ee501f9b46253a5ec5ba816dc028ebe071a50fcd71b2ba613f026d8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB62 5336 bytes
font_01_sfnt_off0000ed70.bin
ee389f83e0233612b10ef469aa0910c95c1e14e3e0f64a0afe2dfd3135972776		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED70 10540 bytes

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