Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0732a86c4c7921…

MALICIOUS

PDF

44.5 KB Created: 2020-08-05 18:22:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dde198cddb628e31ffeb145d2d0a678e SHA-1: 58f37294cf9a50f5f5203a08a592a456d3d12a07 SHA-256: 4b0732a86c4c7921fe3373694ee13174f991fcb6aff2bde8636c26b2d99b675d
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate educational resources, but the primary link redirects to a known malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure suggests an attempt to obscure the malicious intent through a large number of links. The document body, though heavily obfuscated, contains the malicious redirector URL and several benign-looking URLs hosted on Shopify, likely to lend credibility.

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.cc/pify?keyword=biology+book+for+class+9+in+urdu+pdf+free+download
    • http://files.nogears-nofears.com/uploads/1/3/1/0/131070351/6772487.pdf
    • http://files.welcometothegreenroom.com/uploads/1/3/0/8/130874361/553377.pdf
    • http://files.tsxdesignhouse.com/uploads/1/3/1/4/131409200/9ea03.pdf
    • http://files.wcfs.net/uploads/1/3/1/0/131070131/vubuzulixu-sawopunobuzu-sovonutule-buxobiwojufaxid.pdf
    • http://files.sbph.ca/uploads/1/3/1/3/131382032/wegeritibikuvevuta.pdf
    • https://cdn.shopify.com/s/files/1/0433/4800/0927/files/15866152939.pdf
    • https://cdn.shopify.com/s/files/1/0440/3698/0886/files/complex_variables_and_statistical_methods_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0430/8094/1729/files/poulan_lawn_mower_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/9290/8963/files/jimebexed.pdf
    • https://cdn.shopify.com/s/files/1/0432/2862/7099/files/fugupiwufurirakesajaxewi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1497/8718/files/72375560727.pdf
    • https://cdn.shopify.com/s/files/1/0433/8732/2522/files/29846501356.pdf
    • https://cdn.shopify.com/s/files/1/0433/0058/5636/files/68963581387.pdf
    • https://cdn.shopify.com/s/files/1/0431/0034/0381/files/29315328748.pdf
    • https://cdn.shopify.com/s/files/1/0429/7513/3859/files/85930748090.pdf
    • https://cdn.shopify.com/s/files/1/0428/8462/8633/files/breath_holding_spells_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5805/files/6926463600.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_off0000635f.bin
af7f9adda3d9d6eff73b0bab96e5dcb4d199f7f5ba66ab613895ce06c8c7ad63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x635F 5928 bytes
font_01_sfnt_off000077b7.bin
c8c0275d152f6a5c9c44bc91d53c0164d9bf3a216f884aeab2005335f004309d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77B7 14428 bytes

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