Malicious PDF — malware analysis report

Static analysis result for SHA-256 277bb2a4e07681ca…

MALICIOUS

PDF

43.9 KB Created: 2020-10-07 14:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 1d016a065993b773f3c6ea1da5544dec SHA-1: bea2fd79cea8fb7930ee721b28d24c93c1d4b04c SHA-256: 277bb2a4e07681ca9580e37c085ce10bd8ed65e04d02c3d900fb304ab249438b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, forming a link farm designed to redirect users to potentially malicious websites. The primary redirector URL identified is https://ttraff.link/pify?keyword=hot+cheetos+calories+per+gram. The document body, though heavily obfuscated, also contains this URL and numerous other links to PDF files hosted on various domains, suggesting a tactic to distribute malicious content or traffic. The ML classifier 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.link/pify?keyword=hot+cheetos+calories+per+gram In PDF document text
    • http://files.birth-roots.co.uk/uploads/1/3/1/4/131437454/pifesup.pdfIn PDF document text
    • http://siroji.chihimchik.com/uploads/1/3/1/4/131438096/mutupezema.pdfIn PDF document text
    • http://files.evanmueller.net/uploads/1/3/1/3/131381103/0fc9bee60fc5d8d.pdfIn PDF document text
    • http://files.nelsontasmankindergartens.com/uploads/1/3/0/8/130874563/5146129.pdfIn PDF document text
    • https://site-1036936.mozfiles.com/files/1036936/diwasetavujoxedov.pdfIn PDF document text
    • https://site-1042191.mozfiles.com/files/1042191/36054225453.pdfIn PDF document text
    • https://site-1037145.mozfiles.com/files/1037145/zituwovugaparajubenaxufej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8565/1358/files/french_grammar_drills.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7839/3762/files/presto_electric_griddle_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9721/0532/files/79921150771.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1995/2550/files/28215524452.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7847/6195/files/bad_boys_for_life_2020_cast.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/2907/5880/files/spring_salamander_for_sale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7865/7212/files/grand_theft_auto_5_for_android_full_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/4156/6105/files/vuraf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7437/9173/files/88040148262.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/1696/2215/files/endometrial_lining_thickness_radiology.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63C7 5308 bytes
SHA-256: ce4020e03583993993af190c078269a9362907f64fc8b5d6e5dd817650fd4566
font_01_sfnt_off000075a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x75A9 14632 bytes
SHA-256: 0fccd75d88e0e404267891a958058df6b892c219c2555a2443e9534dc4d04bb1

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