Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b81dbba5a10848…

MALICIOUS

PDF

56.8 KB Created: 2020-10-16 10:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 92ad3c2f06547ba0ac75ba1ea43eceec SHA-1: 742575a599bf2a68d5ee099e39617c76d919120a SHA-256: 20b81dbba5a10848bf3d4fe446790cf5c555785e842991927e9cd34b8292dadc
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, includes the URL and a title suggesting a lure for medical information. The presence of a large number of external PDF links, many pointing to Weebly domains, indicates a link farm designed to distribute malicious content or traffic.

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://gettraff.ru/123?keyword=gina+asthma+guidelines+pocket+guide In PDF document text
    • https://lajojixuvoporor.weebly.com/uploads/1/3/0/7/130738555/9600194.pdfIn PDF document text
    • https://dosaremuxabibi.weebly.com/uploads/1/3/0/7/130739916/vakuwumetirogilubufi.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/bagatazojiz_sidatasofugugor_sofaxazute_gureluf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368248/normal_5f87857618086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_5f88985756220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_5f86ff929910a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370533/normal_5f893d858b584.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374009/normal_5f88f5d8d0ec6.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/1/0439/0685/9176/files/dixanusiwawefupib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0500/8277/5212/files/sevier_county_high_school_football_schedule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/6539/3319/files/san_jose_ninja_tournament_2019.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6033/8594/files/biblia_del_pueblo_de_dios_precio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/9204/1624/files/jebariwugilutapavo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/7269/2639/files/elca_decline_2020.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/98546263836.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/1127/1588/files/bujexonokelu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0477/6479/9644/files/96845837180.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6510/6847/files/nesting_bird_survey_protocol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/0986/7431/files/30876196934.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8222/7617/files/3619712484.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f307dfe2-ecb3-46d6-9af9-930d1d9f02b7/64144122007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebefab54-576d-4e65-b1c5-31390aca9c38/famixufuvoliwuxef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d9016e6-88cb-4cee-b5f4-3ccd2c4dbd46/tanivawixunifu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/905c0c89-4ace-4fb8-9a79-776c88f2568f/96226436133.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef2ae323-55ed-4ce9-a212-45ab8e8a2a27/kefazisowulebo.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_off00009ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FFD 5488 bytes
SHA-256: 6afb5e2da75b63042519d78710e335dd6a0c975f2472bb2fe641c120d7c887d0
font_01_sfnt_off0000b27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27F 10220 bytes
SHA-256: 7d862d09c65bdb213e91ccc4b4ee9593e77c0af01c62a718e8921082a8270aab

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