Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d7b135f5dd32e71…

MALICIOUS

PDF

46.6 KB Created: 2020-10-07 04:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 68c158b05c611893f659c6ee1a29c9ee SHA-1: f9d67963e4f36950ddfba5479697f8c2d6e329db SHA-256: 1d7b135f5dd32e71fcdcc027c17d9c9e640fe6cbe18148711c7f44b8fe626c7b
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://cctraff.ru/strik?keyword=hotstar+premium+free+apk+mod In PDF document text
    • https://site-1040200.mozfiles.com/files/1040200/38986940630.pdfIn PDF document text
    • https://site-1037274.mozfiles.com/files/1037274/tobumukuvezi.pdfIn PDF document text
    • https://site-1044017.mozfiles.com/files/1044017/lomuwu.pdfIn PDF document text
    • https://site-1043055.mozfiles.com/files/1043055/ribanunekadujitedafo.pdfIn PDF document text
    • https://site-1040665.mozfiles.com/files/1040665/duluwixesuvabopulipila.pdfIn PDF document text
    • http://files.positiveculture.org/uploads/1/3/1/6/131606186/1c45fbf12a.pdfIn PDF document text
    • http://kewet.cornellactuarialsociety.com/uploads/1/3/0/9/130969627/rojikavugikilej-xavukoponupi-litix-vipewoduzafomom.pdfIn PDF document text
    • http://rajomije.crimsonleavesphotography.com/uploads/1/3/2/7/132740594/rixifofaradumif.pdfIn PDF document text
    • http://files.diocesanschoolofbiblicalstudies.com/uploads/1/3/0/7/130776308/3603486.pdfIn PDF document text
    • http://files.natationcafaanjou.com/uploads/1/3/2/6/132681229/gofojo-lawesit-relajari-jubefumeko.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/1/0483/9650/1149/files/jokaboxoku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0480/8566/3908/files/easton_carbon_bowfire_arrow_chart.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/5477/5458/files/90842351730.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/9995/7669/files/superior_colliculus_function_usmle.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1668/3171/files/yorkies_for_sale_in_bardstown_ky.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1841/0394/files/jeff_spicoli_mr_hand_quotes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3119/0952/files/10651489648.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_off0000770e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x770E 5180 bytes
SHA-256: d742f30d0875cb3d7fcbc9ad1572dd45620ddc8f8ab76ae5e850b3db854027a6
font_01_sfnt_off0000889a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x889A 10648 bytes
SHA-256: 19523d75cec1c233a2730bd87e556f7f9b7ce3a5a9d959f4080b31ed4fc2e65a

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