Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a0d3d6152d08d9…

MALICIOUS

PDF

41.9 KB Created: 2020-08-18 18:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1afb06e2e69f446592891d7c2870aae7 SHA-1: 028652de275effe8b8ae10a7ebffa4b7688c4308 SHA-256: a8a0d3d6152d08d950156f72c505903e1508cce13d772b8c32f3cc23d8ed67ff
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends

The PDF contains a significant number of embedded links, characteristic of a link farm, with the primary redirector URL being https://ttraff.ru/pify?keyword=6+week+old+kitten+feeding+guide. This suggests the document's purpose is to lure users to malicious sites. The ML classifier strongly supports the malicious verdict.

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=6+week+old+kitten+feeding+guide
    • http://files.fbcrecreation.com/uploads/1/3/0/7/130776110/b59f90b7.pdf
    • http://rxmedson.com/
    • https://cdn.shopify.com/s/files/1/0440/4926/8886/files/retaining_wall_design_spreadsheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/0147/9321/files/deliwukik.pdf
    • https://cdn.shopify.com/s/files/1/0430/8631/5684/files/general_ability_test_year_3.pdf
    • https://cdn.shopify.com/s/files/1/0454/6409/2822/files/58683043581.pdf
    • https://cdn.shopify.com/s/files/1/0435/3861/2378/files/lipopivelazepager.pdf
    • https://cdn.shopify.com/s/files/1/0440/5798/5189/files/git_set_origin_upstream.pdf
    • https://cdn.shopify.com/s/files/1/0428/0185/6668/files/dovobobawinitowitoneg.pdf
    • https://cdn.shopify.com/s/files/1/0430/5967/5290/files/83204399193.pdf
    • https://cdn.shopify.com/s/files/1/0438/8388/8808/files/assessing_construct_validity_in_organizational_research.pdf
    • https://cdn.shopify.com/s/files/1/0429/8083/5482/files/hex_code_white.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_off000068dc.bin
038f4ae474d6826a379a7d32906564b0b33e262d4955ba7dc4ddc0cdb241a2fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68DC 4808 bytes
font_01_sfnt_off00007960.bin
739fc887fdd8f1886fb34d5216b879452cf4c795f393ac45dd117e16d6d6fbd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7960 9900 bytes

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