Malicious PDF — malware analysis report

Static analysis result for SHA-256 166bf7985a401e64…

MALICIOUS

PDF

45.5 KB Created: 2020-09-21 21:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 3497daa3b49ea49506263da74ff96089 SHA-1: 30bf5252ccbd46ff33b7ca303dee8e7b11c8b068 SHA-256: 166bf7985a401e64d1040bc0e67ef91039a2042147d8ba22bf5633937219050e
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.club/wix?keyword=apex+legends+text+to+speech+not+working In PDF document text
    • http://gokozarum.gracepublicationsindia.com/uploads/1/3/1/3/131381886/3218328.pdfIn PDF document text
    • http://bumilurer.shireenliane.com/uploads/1/3/1/4/131437233/fotugor.pdfIn PDF document text
    • http://sulug.kelseycarroll.net/uploads/1/3/0/7/130740323/2fe53d.pdfIn PDF document text
    • http://navew.taiwanhotelnews.com/uploads/1/3/0/8/130813714/pumenixuwifo.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/1/0430/7222/5442/files/nerasudelemudijuloxejanuv.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0531/2163/files/casper_test_login.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0673/0138/files/8041581413.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6101/0842/files/vasixi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3152/7577/files/temporary_employment_contract_template_philippines.pdfIn PDF document text
    • https://0cd96995-3846-4afc-b630-0030a6a9b6dd.filesusr.com/ugd/2a1429_f00e979130dc416db4279cdf9ab5be64.pdf?index=trueIn PDF document text
    • https://71463db4-d269-4340-b2a6-f89b49c5e41f.filesusr.com/ugd/21e9e0_91485f5ef2d94fb0b7bae46d43aa7521.pdf?index=trueIn PDF document text
    • https://7d6c4588-78a3-4c81-9cf9-fc6a6dd3b9e0.filesusr.com/ugd/8e1900_368ba87fe0404c1ca38f1323c55e22ce.pdf?index=trueIn PDF document text
    • https://4eda1312-b325-43d9-b421-bb59b6e1a47b.filesusr.com/ugd/062c90_55d6a3387c7744378ca83d04539d96f2.pdf?index=trueIn 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_off0000734d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x734D 5336 bytes
SHA-256: dd997e1310bda4897205b235e09c3266b25a69932d7281a13310464fbd343d5f
font_01_sfnt_off0000858a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x858A 10420 bytes
SHA-256: 8fe84782c1f62f24ceb8d9543886f090bd7fa80692f116b17a93a704b16641b6

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