Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1588efb7d920d6…

MALICIOUS

PDF

78.4 KB Created: 2020-08-30 21:51:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee4e93e356805c0dcbc2c36bb43cde50 SHA-1: 4aec9519f7aa2c82c5792fe9b9a583b9c5d1705e SHA-256: 3c1588efb7d920d61192ff221fd412dcbe825fcd96a3e7ce438e71f4ca1808e5
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, forming a link farm, with one prominent link pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The primary malicious URL identified is https://ttraff.ru/wix?keyword=divinity+2+recharge+purging+wand, which likely serves as a lure for further malicious activity. The presence of a link farm suggests an attempt to manipulate search engine results or distribute content broadly.

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=divinity+2+recharge+purging+wand
    • https://static.usrfiles.com/ugd/b8c837_f7ff80c11ae94b4089f18f942b4414f5.pdf
    • https://static.usrfiles.com/ugd/b6edda_1be093bc0d9749e994f16443b791086a.pdf
    • https://static.usrfiles.com/ugd/0f1814_fdd5ea529c4a4c6495252fe61477104e.pdf
    • https://static.usrfiles.com/ugd/90423f_2fafff26fa884bdfbfe74b011eade32c.pdf
    • https://static.usrfiles.com/ugd/5e8de6_00e8daf48f8541b29115d1e198d02678.pdf
    • https://static.usrfiles.com/ugd/b5aed9_408adb84a8e9404d8459a14f6423505b.pdf
    • https://static.usrfiles.com/ugd/b8c837_3a0802128e5744a5915a5a9dec67ab6b.pdf
    • https://static.usrfiles.com/ugd/b8c837_41d861efb37249c79c5cdb82e032f555.pdf
    • https://cdn.shopify.com/s/files/1/0440/7951/3752/files/59343792337.pdf
    • https://cdn.shopify.com/s/files/1/0432/9570/3195/files/33593120511.pdf
    • https://cdn.shopify.com/s/files/1/0437/8594/5246/files/baixar_curso_de_ingles_em_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lozafawofife.pdf
    • https://cdn.shopify.com/s/files/1/0438/4836/8288/files/jelibajijamekovarir.pdf
    • https://cdn.shopify.com/s/files/1/0434/4184/8470/files/fruit_tree_pruning_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/2258/9853/files/jipizow.pdf
    • https://cdn.shopify.com/s/files/1/0462/6428/7381/files/vejoloxibej.pdf
    • https://cdn.shopify.com/s/files/1/0435/0479/5800/files/62064925267.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_off0000f5b8.bin
196a8e0705cbe5063289a764cf68ce844667961671a2bcc8889a50813afb1dd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 5508 bytes
font_01_sfnt_off0001088b.bin
884dce1a074be8698ec4acd9aa0a47a37710f79fbe89e9f30ac7eb37809fbe0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1088B 10716 bytes

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