Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1ea74be134ae78…

MALICIOUS

PDF

56.4 KB Created: 2020-08-24 18:31:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e487d7bf378a9b9eda115a53c0b73236 SHA-1: 4d8bdcca07de6b62a700684da66e647fe33eb4c2 SHA-256: 0a1ea74be134ae7813bb0733a17511a33ad028b36bf7558e74e85f36c8828eea
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically the URL https://ttraff.com/pify?keyword=dvt+prophylaxis+guidelines+aspirin. It also exhibits characteristics of a PDF link farm, embedding numerous external links, many of which point to benign Shopify domains but are likely used to obscure the malicious redirector. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lure users to malicious sites.

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/pify?keyword=dvt+prophylaxis+guidelines+aspirin
    • http://misezif.virtualvideoeditors.com/uploads/1/3/0/7/130739232/67e9d91.pdf
    • http://vapob.pierremichelsalon.com/uploads/1/3/0/8/130873927/vawiwuma.pdf
    • http://gerofuk.anitariddlebsnportfolio.com/uploads/1/3/1/3/131398244/9623531.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/5679/0678/files/gekisidokerixipidegaf.pdf
    • https://cdn.shopify.com/s/files/1/0435/5496/3617/files/aptoide_tv_apk_old_version.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/12627983692.pdf
    • https://cdn.shopify.com/s/files/1/0441/3282/7288/files/8595240604.pdf
    • https://cdn.shopify.com/s/files/1/0432/9334/3912/files/245986050.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/xofipegipajufulijejo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1618/2184/files/beginner_guitar_tabs.pdf
    • https://cdn.shopify.com/s/files/1/0431/3281/3473/files/jegavididoleduvagewula.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38664456414.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1012/files/17082687466.pdf
    • https://cdn.shopify.com/s/files/1/0431/5106/5243/files/code_formatter_online_css.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_off000090e1.bin
f826646e66de3fe8417a1b6be4a2478274a2b9bb3f085c119e806ab3b496c75f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90E1 5332 bytes
font_01_sfnt_off0000a304.bin
614367b5e1b89cbfb555bb556d8c059514694cafadfbc356c567d72c9d9727fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA304 10376 bytes
font_02_sfnt_off0000c68c.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC68C 4324 bytes

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