Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a4fb498a166b56…

MALICIOUS

PDF

51.9 KB Created: 2020-07-30 03:39:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2134934bf5a5a817b617d6ea0a3f3448 SHA-1: 4b9d746d335b117c97f27348e7d0321fde571be9 SHA-256: 26a4fb498a166b56b3bb9be82d31e766122f48f9cfccc9d64c0af4be6a627a1d
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. Additionally, it exhibits a PDF link farm with numerous external links, including one hosted on 'cdn.shopify.com'. The ML classifier strongly flagged this PDF as malicious. The document body appears to be malformed or obfuscated, preventing a clear understanding of its intended lure beyond the malicious links.

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.ru/pify?keyword=autocad+2020+user+manual+pdf
    • http://files.wildgooseqigongpdx.com/uploads/1/3/1/4/131437604/lizofifuvi.pdf
    • http://files.a2consultation.com/uploads/1/3/1/4/131482941/forud.pdf
    • http://files.eslboom.com/uploads/1/3/0/8/130814052/konamivitowododowuwu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gekisemegudifusoledo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2938/1791/files/3611825461.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/zasesisalatufotiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/7791/7079/files/fexowuvowofadapomawukutu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6986/6141/files/surevopavalasenuxisevizi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7353/5138/files/12259101681.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/17844710077.pdf
    • https://cdn.shopify.com/s/files/1/0432/0660/7012/files/853682724.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mesujegixaxufusataxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/2934473971.pdf
    • https://cdn.shopify.com/s/files/1/0430/5115/5609/files/ziboxuluturipimuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/2413/7890/files/zumuvinemadotowefuluk.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/
    • https://cdn.shopify.com/s/files/1/0430/6986/6141/files/surevopavala

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008cd9.bin
89ca690b69b6abd04696a00054eebe50750e8b616537b4150c4b5fa83e122255
pdf-font-stream PDF embedded font (sfnt) at offset 0x8CD9 5396 bytes
font_01_sfnt_off00009f0e.bin
e8919d18010582ff09daf684d1b85bfc2d8e5f2e8c5e9b2d3cc4699748ae269e
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F0E 10268 bytes