Malicious PDF — malware analysis report

Static analysis result for SHA-256 14b7a3be6adab653…

MALICIOUS

PDF

44.2 KB Created: 2020-08-11 00:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08a9c239db24e4d123ec6911ffdd98c7 SHA-1: 05cd55bb46f5924d2781263a03b92a2c60a89759 SHA-256: 14b7a3be6adab65376ac83d4c3d9f748c374dd7e0a6bcbf635e593841deeb982
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, with a critical heuristic firing for a malicious redirector link. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO spam campaign, potentially leading to malicious sites or phishing pages.

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=narasimha+kavacha+iskcon+pdf
    • http://merogegoj.mw-earrings.com/uploads/1/3/1/3/131379179/belogemizudoxa-mulebemepetizik-lorujap.pdf
    • http://files.jackiesskinbeautiful.com/uploads/1/3/0/7/130738822/rurujifimusa.pdf
    • http://files.computerzone1.com/uploads/1/3/1/6/131606668/wojatixodo.pdf
    • http://kilezul.cafecesura.com/uploads/1/3/0/8/130874601/3625273.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0430/7746/8327/files/nikego.pdf
    • https://cdn.shopify.com/s/files/1/0435/5211/2808/files/fizzbuzz_solution_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0434/0052/8033/files/funny_photoshop_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0429/5157/3657/files/35737782522.pdf
    • https://cdn.shopify.com/s/files/1/0435/0020/8294/files/small_text_to_excel.pdf
    • https://cdn.shopify.com/s/files/1/0432/5313/7576/files/vizarapemex.pdf
    • https://cdn.shopify.com/s/files/1/0431/0899/1140/files/futebunapefupimizepifob.pdf
    • https://cdn.shopify.com/s/files/1/0431/0401/0389/files/78605620516.pdf
    • https://cdn.shopify.com/s/files/1/0430/3329/7058/files/ritajizufoligojepufadariv.pdf
    • https://cdn.shopify.com/s/files/1/0436/9232/7077/files/delta_pilot_contract_2016.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006413.bin
84b422a07832c16f0ef721208ebfadd8afdae70c72a39a7de701364e4a71d11a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6413 5456 bytes
font_01_sfnt_off0000767d.bin
ab8da4149aabe89d5f1f1c2b05371181567483ad95d34ab8378fc1f5e62f3362		 pdf-font-stream PDF embedded font (sfnt) at offset 0x767D 10080 bytes
font_02_sfnt_off00009927.bin
cba5f74efde00b08572687be94f62dc809644252f25f49ebc515c3eae0593eb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9927 2572 bytes

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