Malicious PDF — malware analysis report

Static analysis result for SHA-256 7691567f64bdc60a…

MALICIOUS

PDF

40.4 KB Created: 2020-08-03 04:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac6a5d8ef7ab9006526e67bd1ff92197 SHA-1: 6532ab6769e8e668fc0b7edb6b2dbea4e591a349 SHA-256: 7691567f64bdc60ae9b51867ef2876a42658bc61c7849efa327b1618702c1ae0
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, masquerading as a manual for a Tascam DR-05. One of these links, 'https://ttraff.ru/pify?keyword=tascam+dr-+05+manual', is identified as a malicious redirector. The document also exhibits characteristics of a link farm, with many links pointing to other PDF files hosted on various domains, including multiple Shopify-hosted PDFs. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful 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.ru/pify?keyword=tascam+dr-+05+manual
    • http://files.edhgs.com/uploads/1/3/1/4/131408529/lujaremokike_nezuki_derunelizaxeti_kelabij.pdf
    • http://files.thelangsisters.com/uploads/1/3/0/9/130969705/zulegafe.pdf
    • http://files.bestclubsnyc.com/uploads/1/3/1/6/131637316/rexejudu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/9066/4860/files/88245594542.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/wikolimufala.pdf
    • https://cdn.shopify.com/s/files/1/0436/1102/9666/files/vulonotepojevuvi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/zupaxabexawu.pdf
    • https://cdn.shopify.com/s/files/1/0430/7661/6346/files/2801683570.pdf
    • https://cdn.shopify.com/s/files/1/0430/7940/1634/files/office_365_product_key.pdf
    • https://cdn.shopify.com/s/files/1/0431/4949/2384/files/kibopamisus.pdf
    • https://cdn.shopify.com/s/files/1/0434/5076/1377/files/muripivudipeviguzogaten.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wulusiwebope.pdf
    • https://cdn.shopify.com/s/files/1/0431/9805/4558/files/79754342821.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_off0000481c.bin
39b3f8f32d7eec8d7fde939aaedb44ac342a3014b24f268fd3636cce19523d73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x481C 4856 bytes
font_01_sfnt_off00005876.bin
545fcc2a0a34bfd45751cb8bb16aef5af7b6b56c0726e0939afd0d714be5e8ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5876 14812 bytes
font_02_sfnt_off000086d2.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86D2 4324 bytes

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