Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd43ec74e48eeb79…

MALICIOUS

PDF

36.2 KB Created: 2020-08-24 12:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8fe8d8e69e39ba7580e7c0cf3715140 SHA-1: 55c1f371d7988b9437cb2af05bd00be6c3c958ab SHA-256: dd43ec74e48eeb79b640b8dfb62e398943f4a90056b2c141a0f3a1e2b990211e
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.ru. The document body, though partially obfuscated, contains text related to 'worksheet on subject pronouns for grade 1', suggesting a lure to disguise the malicious intent. 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.ru/pify?keyword=worksheet+on+subject+pronouns+for+grade+1
    • http://files.infertilityoutloud.net/uploads/1/3/0/8/130814515/derisulirazubibiv.pdf
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/23786421683.pdf
    • https://cdn.shopify.com/s/files/1/0438/2310/4162/files/soul_calibur_2_pc_game.pdf
    • https://cdn.shopify.com/s/files/1/0435/2147/4714/files/fibalazadedefisofe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9383/5432/files/38025435343.pdf
    • https://cdn.shopify.com/s/files/1/0435/5588/1121/files/xefudojetidapefekum.pdf
    • https://cdn.shopify.com/s/files/1/0437/9607/0560/files/wutubodexurapewifobojub.pdf
    • https://cdn.shopify.com/s/files/1/0431/8471/7979/files/7106681037.pdf
    • https://cdn.shopify.com/s/files/1/0431/2026/3322/files/10765644292.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/ascii_finger_guns.pdf
    • https://cdn.shopify.com/s/files/1/0428/1637/2892/files/diagnostico_social_comunitario.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_off00004b61.bin
675ab0cd1541d42e758d39efe902496a91f3ee917ac616a5c12b1b1992fca404		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B61 5728 bytes
font_01_sfnt_off00005efa.bin
cbfb3d55ae87bacb5629b51dd8956b505b93251af32f6e530d8f6ae8a1be75de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFA 11516 bytes

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