Malicious PDF — malware analysis report

Static analysis result for SHA-256 1588be5e7a09f7c5…

MALICIOUS

PDF

48.9 KB Created: 2020-08-30 01:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a22ccb49aa285b5a7578236b4cfa65d SHA-1: 60a03b1c32110504de42dab55c16aba8cf4f25e5 SHA-256: 1588be5e7a09f7c5dae1e3746f31b93aa3fb8bd3293400075ab26b585e4d338d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to ttraff.ru. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a mass of external links, many of which are to Shopify-hosted PDFs. The ML classifier also strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely used to funnel victims to 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.ru/wix?keyword=importancia+social+de+las+virtudes+m
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7368/3100/files/75417373191.pdf
    • https://cdn.shopify.com/s/files/1/0462/0989/2505/files/cetoacidosis_diabetica_tratamiento_nutricional.pdf
    • https://cdn.shopify.com/s/files/1/0456/4503/7735/files/75355143601.pdf
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/89348208585.pdf
    • https://static.usrfiles.com/ugd/238140_83528a55ef7a4968965b45e5b768df64.pdf
    • https://static.usrfiles.com/ugd/b8c837_d4331bf6850348ae97cdea7eee0664fe.pdf
    • https://static.usrfiles.com/ugd/724bd4_fd410ead2eaa43cc88efd7b6de31cf5d.pdf
    • https://static.usrfiles.com/ugd/0aab01_8e091bb2a461411ba393d98871b1c851.pdf
    • https://cdn.shopify.com/s/files/1/0434/4345/4102/files/xfinity_wifi_password.pdf
    • https://cdn.shopify.com/s/files/1/0429/1294/0188/files/31955503330.pdf
    • https://cdn.shopify.com/s/files/1/0431/2825/8726/files/lymphoma_follow_up_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0437/7791/7085/files/aristoteles_y_dante_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/9917/6612/files/47040725213.pdf
    • https://cdn.shopify.com/s/files/1/0435/2681/5895/files/vubukavujogomefajaras.pdf
    • https://cdn.shopify.com/s/files/1/0432/7368/3100/files/weditarozabawexo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/jepep.pdf
    • https://cdn.shopify.com/s/files/1/0429/9502/4023/files/44305129468.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008099.bin
67bd60009e5fd7ab4a67ab9fd57b702cf48a71b364bd9c68847baa001ab415a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8099 5216 bytes
font_01_sfnt_off00009232.bin
d86b9c08179c99cc715ee3c55d45ca69c39af74ea3630a41e0a4c9a9af0b3a67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9232 10736 bytes

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