Malicious PDF — malware analysis report

Static analysis result for SHA-256 38af822c21d9b43d…

MALICIOUS

PDF

39.7 KB Created: 2020-08-19 03:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd16856e98e469255a62a027ad9fa815 SHA-1: 28224fa3d46e922504ad3235a53c1dd493621f58 SHA-256: 38af822c21d9b43d8e2a3e040f705264430de7114d9604216ffadf0c1c9a1edb
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at ttraff.com. The document body, though heavily obfuscated, contains text that appears to be a search query related to physics, likely intended to trick users into clicking the malicious link. The ML classifier also strongly indicated maliciousness.

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=que+es+movimiento+uniforme+en+fisica+wikipedia
    • http://files.zenithfitnesstraining.com/uploads/1/3/2/6/132681823/lopisesu.pdf
    • http://files.midnightriderbrts.org/uploads/1/3/0/8/130874180/nirosogig.pdf
    • https://cdn.shopify.com/s/files/1/0437/8086/6209/files/36295069364.pdf
    • https://cdn.shopify.com/s/files/1/0430/2805/4169/files/modetavewononezoja.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/62935009555.pdf
    • https://cdn.shopify.com/s/files/1/0428/7463/4403/files/14819801912.pdf
    • https://cdn.shopify.com/s/files/1/0434/7337/1300/files/85888433426.pdf
    • https://cdn.shopify.com/s/files/1/0437/4229/8264/files/malirajuwedujapodowebil.pdf
    • https://cdn.shopify.com/s/files/1/0440/0631/0046/files/sixth_sense_technology_in_ieee_format.pdf
    • https://cdn.shopify.com/s/files/1/0433/3964/5093/files/35190528526.pdf
    • https://cdn.shopify.com/s/files/1/0431/7977/0019/files/65008584061.pdf
    • https://cdn.shopify.com/s/files/1/0434/9581/7382/files/66183515600.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005625.bin
bf7fc62a6580235b64b6122f77d4dc46948f4c6d8935af2775731370d5c208ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5625 5544 bytes
font_01_sfnt_off00006905.bin
c1e171d1eac600c561c617db268bbcabf482eb26ff625d250318768878af7651		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6905 13032 bytes

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