Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ecf73d6ab3ac8b3…

MALICIOUS

PDF

45.4 KB Created: 2020-08-20 00:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f93e34701036e82ba3ccda97ad8344d2 SHA-1: 752322b3eb733820415f59216b3edec6ad038db2 SHA-256: 4ecf73d6ab3ac8b3474404bf445f16b1584e8ec01a08021bdb0d1f98d28891d2
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a BMW X1 driver's manual. This redirector likely leads to a malicious payload or phishing page. The document also contains a large number of links to other PDFs hosted on various domains, suggesting a link farm or SEO poisoning attempt to increase visibility. The ML classifier strongly flagged this PDF as malicious.

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=bmw+x1+2013+drivers+manual
    • http://nixesi.danapayne.net/uploads/1/3/0/7/130738748/togagosedikini-lezabalekomepo-pumego.pdf
    • http://wulima.coburghighhistorical.org/uploads/1/3/1/6/131606289/medewovimelos_vuvirerabod_nejafulates_gokoposuti.pdf
    • http://files.bhillartistry.com/uploads/1/3/2/6/132680955/dekipegizovupe-durulo.pdf
    • http://files.moniquesamonephotography.com/uploads/1/3/1/3/131398221/ddc7d2.pdf
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/17837666151.pdf
    • https://cdn.shopify.com/s/files/1/0431/1734/6976/files/60025576708.pdf
    • https://cdn.shopify.com/s/files/1/0437/8466/7287/files/aoac_official_methods_of_analysis_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/6152/6179/files/assignment_front_page_format.pdf
    • https://cdn.shopify.com/s/files/1/0430/6717/9165/files/bajizebilolujul.pdf
    • https://cdn.shopify.com/s/files/1/0431/1918/1985/files/15432992322.pdf
    • https://cdn.shopify.com/s/files/1/0432/0913/0143/files/ibps_bank_clerk_syllabus_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8892/9187/files/dragon_ball_z_androids_saga.pdf
    • https://cdn.shopify.com/s/files/1/0431/9884/0995/files/apprendre_le_russe_facilement.pdf
    • https://cdn.shopify.com/s/files/1/0437/5796/1374/files/luxubiwirogekutobozaja.pdf
    • https://cdn.shopify.com/s/files/1/0430/7124/2389/files/71199605652.pdf
    • https://cdn.shopify.com/s/files/1/0430/9857/0909/files/pivawuxedulumosuxul.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kewosa.pdf
    • https://cdn.shopify.com/s/files/1/0439/9906/8310/files/badminton_court_size_in_feet.pdf
    • https://cdn.shopify.com/s/files/1/0446/3358/7875/files/best_cisa_study_guide_2019.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_off000062c8.bin
30ebe32ae956d463302202fb6d6cc2299eecda7a04f475f79f553a3862b78fe9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62C8 5424 bytes
font_01_sfnt_off00007522.bin
c5b2e8cb5e6dd9b4abcb194038b7aa063b279729d27324ddcb5e54e225de71b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7522 11352 bytes
font_02_sfnt_off00009a35.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A35 4324 bytes

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