Malicious PDF — malware analysis report

Static analysis result for SHA-256 31cad74f5af5e0bd…

MALICIOUS

PDF

46.6 KB Created: 2020-08-12 08:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4223c29ef4a4a4df46dc612e19a1289 SHA-1: 172cc1246f6938e55373da2681725deb11c44ca5 SHA-256: 31cad74f5af5e0bd43bffc0414fa52b9ccc0b520c6a69f4fd334768907827a00
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and a reference to a PDF file hosted on Shopify. This suggests a phishing or scam attempt where the user is directed to a malicious site under the guise of accessing a document. No scripts were extracted, limiting the analysis of further execution chains.

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=bronchospasme+en+anesthesie+pdf
    • http://zuxuvimex.mitchellband.org/uploads/1/3/0/8/130814297/7909546.pdf
    • http://files.rebeccaevansam.com/uploads/1/3/1/3/131379591/e1000.pdf
    • http://files.framemysore.org/uploads/1/3/1/3/131384789/7349004.pdf
    • https://cdn.shopify.com/s/files/1/0432/4550/2626/files/1968_dodge_truck.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8023/files/libros_sobre_el_bullying_escolar.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/71588511517.pdf
    • https://cdn.shopify.com/s/files/1/0440/3894/6981/files/48488818039.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/sinatiro.pdf
    • https://cdn.shopify.com/s/files/1/0429/7618/2426/files/remizero_save_me.pdf
    • https://cdn.shopify.com/s/files/1/0432/4347/1003/files/weight_watchers_points_plus_calculator_apps.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6517/files/24432173698.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3429/files/gevokozuma.pdf
    • https://cdn.shopify.com/s/files/1/0429/8289/9871/files/16570012478.pdf
    • https://cdn.shopify.com/s/files/1/0429/9715/3943/files/kasilewipilubokozaxil.pdf
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/91759930539.pdf
    • https://cdn.shopify.com/s/files/1/0430/9155/8551/files/84032244664.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006535.bin
8938f5a850c9b40b1b02ba07d1f227d3aa5e0fa3b92cf4c945642114bccd67dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6535 5200 bytes
font_01_sfnt_off000076a0.bin
093af9f10862ef7ff289affe38e7a0813e8afa8b97360069bebb538a03ec7e61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A0 12456 bytes
font_02_sfnt_off00009dfc.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DFC 4324 bytes

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