Malicious PDF — malware analysis report

Static analysis result for SHA-256 940f3f7e7821ddf7…

MALICIOUS

PDF

46.1 KB Created: 2020-08-12 11:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5aa77d06fa71dd647c1f2fec1c68d5e SHA-1: 6f63b9b19238563b05625f269a0396256a74e417 SHA-256: 940f3f7e7821ddf7c0c265d025cdfa18517e125ee41581b940f52d56d84a2431
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at "ttraff.com". The document body also contains the text "Universal antidote pdf", suggesting a lure to entice users to click on the malicious links. The presence of a large number of external PDF links, many hosted on Shopify, further supports a link farm or SEO poisoning attack pattern.

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.com/wb?keyword=universal%20antidote%20pdf
    • http://lezudem.hardware4ships.com/uploads/1/3/0/7/130738714/zulefozakupazuvavop.pdf
    • http://files.jms.services/uploads/1/3/0/8/130813778/luxefutof-fapezejok-pubiguwulelole-zonelabalulelu.pdf
    • http://jotadawaj.puretestimony.org/uploads/1/3/1/4/131482853/5042427.pdf
    • http://files.concernedchristiancitizens.org/uploads/1/3/1/4/131453623/7943297.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5807/files/riluzusezukevubinapopifez.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/12226197943.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pamuzinesikajojefex.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/livoxigugefeguvon.pdf
    • https://cdn.shopify.com/s/files/1/0427/9438/5575/files/gufetatagadoxike.pdf
    • https://cdn.shopify.com/s/files/1/0438/7468/0987/files/24946718969.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sebifoxof.pdf
    • https://cdn.shopify.com/s/files/1/0434/0265/7957/files/40794558271.pdf
    • https://cdn.shopify.com/s/files/1/0429/2873/4375/files/jerofilejajibulakemot.pdf
    • https://cdn.shopify.com/s/files/1/0430/9542/5191/files/all_star_superman_comic.pdf
    • https://cdn.shopify.com/s/files/1/0440/8921/3093/files/punapozafuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/3184/6296/files/sumiles.pdf
    • https://cdn.shopify.com/s/files/1/0434/5580/7654/files/gigutafedumu.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_off00006628.bin
bc1d7b26c668959a7ac3621e3a5d7069d8b40b9ba827605d3cac6dd8c4985a22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6628 5088 bytes
font_01_sfnt_off00007788.bin
9490991bde9ecf10dd87b240fb5a45a605ff563462d7360e0d2839448ba9957d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7788 17140 bytes

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