Malicious PDF — malware analysis report

Static analysis result for SHA-256 717610dfc04a542a…

MALICIOUS

PDF

33.2 KB Created: 2020-08-24 22:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 56894c803fed79cad39be34cd7c5ba54 SHA-1: 02283803e8907041ccb4832da80d6357a521bd6e SHA-256: 717610dfc04a542a4a5d8ad2376f648dccfe05e07e7186ab44315976086154fa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the string 'messenger lite aptoide' and the malicious redirector URL, suggesting a lure for potentially unwanted software or phishing. The ML classifier strongly flagged this PDF as malicious, supporting the presence of malicious content.

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.com/pify?keyword=messenger+lite+aptoide In PDF document text
    • http://files.impactrouterwanda.com/uploads/1/3/1/8/131871951/85455a91389a1c7.pdfIn PDF document text
    • http://files.nickjagger.org/uploads/1/3/0/7/130738984/sukariwenazeboxezaw.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/1/0429/7365/9290/files/bejeweled_3_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2297/4117/files/facetime_app_for_iphone_6_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2598/7734/files/632816095.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3313/3209/files/13997854715.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0459/7055/5047/files/fanolepa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/premier_league_2020_19_fixtures.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8493/7384/files/gemakafurotejubixelawatol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/6401/1421/files/area_and_perimeter_of_polygons_worksheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/lodebepogekikopulu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2626/7806/files/xejofa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0963/7533/files/pakuleresesemofemokabera.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_off00004668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4668 5132 bytes
SHA-256: a65a1d125ac1b009f35371c68d47022f704dbc39b3ba7642d32168ecbc4ce243
font_01_sfnt_off000057e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57E6 9560 bytes
SHA-256: 179f5af0bee75d15e203b750f83407e7f8c32b1a203ece2f2ff563fb17b71867

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