Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8a351d13869d3f…

MALICIOUS

PDF

54.6 KB Created: 2020-10-06 23:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 16594ccd79365e34971e5b5e1a3401b6 SHA-1: ef6a00586434d39088229b6202b625461c6f1492 SHA-256: bc8a351d13869d3fef7cba31fc1a9dc53422d0e6914e37d3960fbad8c56d8faa
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links pointing to external PDF files hosted on various domains, many of which appear to be disposable. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document's primary function appears to be acting as a link farm, likely for SEO manipulation or to distribute further malicious content.

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/pify?keyword=yoga+vasistha+pdf+hindi In PDF document text
    • https://site-1038530.mozfiles.com/files/1038530/vutubarotegovamosuva.pdfIn PDF document text
    • https://site-1039444.mozfiles.com/files/1039444/zodadunurezebuzo.pdfIn PDF document text
    • https://site-1043096.mozfiles.com/files/1043096/girejuxononojaf.pdfIn PDF document text
    • https://site-1039703.mozfiles.com/files/1039703/peselejukubepaz.pdfIn PDF document text
    • https://site-1038780.mozfiles.com/files/1038780/suduzidukimudid.pdfIn PDF document text
    • https://site-1037114.mozfiles.com/files/1037114/12499563968.pdfIn PDF document text
    • https://site-1040050.mozfiles.com/files/1040050/latevulemebanukir.pdfIn PDF document text
    • https://site-1039921.mozfiles.com/files/1039921/mejotekokaven.pdfIn PDF document text
    • http://files.lazarushandplane.com/uploads/1/3/1/4/131454269/201ecf80d.pdfIn PDF document text
    • http://nenad.guesteyes.com/uploads/1/3/0/7/130775540/d9aa73818.pdfIn PDF document text
    • http://nalumakul.800steps.com/uploads/1/3/0/8/130874030/mufajal-gidadufep-nixunizo-dijarefufafi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1475/8293/files/cuisinart_airfryer_toaster_oven_recipes_bacon.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0476/9382/4166/files/506925066.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2804/6233/files/the_kill_order.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CE1 5196 bytes
SHA-256: c993c6b9ab710dcd56d1e2e92b47f6dfae5f5d6a521f08526f64b1f2ef8da859
font_01_sfnt_off00007e9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E9B 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off000089fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89FE 10948 bytes
SHA-256: 5c9d126f8683991c7de62e0d0ceba1dcd3bf8b22e6e1d89746e437b5fd2b052a
font_03_sfnt_off0000aed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED7 9292 bytes
SHA-256: 50ba218b9d448ac5ee15c4628adb5d2a1d5d1ebca0d56867bb0c2fc42a6e96d8

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