Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cda00d5164c9ed3…

MALICIOUS

PDF

35.6 KB Created: 2020-08-11 04:14:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c99674db642f260ad79fa44ea2d002c7 SHA-1: 320d6d0f8ca583d6446a53d35e3c6d90bbae07fc SHA-256: 4cda00d5164c9ed33ca4e5b723b655e4d92fc1eafe7838230e8557ee50b21144
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body, though partially corrupted, contains text related to 'promissory note pdf telugu' and a URL pointing to a redirector. This suggests the document's primary purpose is to trick users into clicking malicious links, likely for phishing or malware distribution.

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.com/pify?keyword=promissory+note+pdf+telugu
    • http://files.ogdentow.com/uploads/1/3/0/9/130969204/45b0bc.pdf
    • http://files.westminsterbible.org/uploads/1/3/1/0/131070192/fofima.pdf
    • http://files.integritybuildersandassociates.com/uploads/1/3/0/7/130740385/mupobasuwaru.pdf
    • http://files.silverjinnstudios.com/uploads/1/3/1/3/131380944/lekunupak_xumekuvolo.pdf
    • http://mevoma.iamsonofgod.net/uploads/1/3/1/0/131071157/e777a2aaa42.pdf
    • https://cdn.shopify.com/s/files/1/0448/2806/5949/files/twilight_graphic_novel_volume_1.pdf
    • https://cdn.shopify.com/s/files/1/0429/5173/7498/files/antony_and_cleopatra_critical_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0427/9900/5863/files/cdpo_question_paper_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0440/5270/9526/files/c_generate_random_number_in_range.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kekesapenogetiru.pdf
    • https://cdn.shopify.com/s/files/1/0428/1496/3868/files/kruskal_algorithm_c.pdf
    • https://cdn.shopify.com/s/files/1/0429/5639/0559/files/rotebasunuguvurebelifimuz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9911/2099/files/80330588258.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6651/files/55937881015.pdf
    • https://cdn.shopify.com/s/files/1/0430/1779/7785/files/62231691760.pdf
    • https://cdn.shopify.com/s/files/1/0430/3942/4669/files/bibum.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/jaregasesojijebatawelok.pdf
    • https://cdn.shopify.com/s/files/1/0441/1038/1208/files/basic_electrical_engineering_objective_questions_and_answers.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_off00004fcb.bin
13c654328dedce666803f4c027231280a4d16cc027e9fe310e56137d353304f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FCB 5252 bytes
font_01_sfnt_off00006199.bin
6ed9048284ebd808bb6efe5a37d106891438a59d01e91763c36e569f6309a4bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6199 9328 bytes

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