Malicious PDF — malware analysis report

Static analysis result for SHA-256 a68584f1d1d02248…

MALICIOUS

PDF

45.5 KB Created: 2020-08-21 09:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 097a6bd88b82a3b2b8178097512eaea6 SHA-1: 02b4ef92d9d02530864296880d3f76a86f1a1f7d SHA-256: a68584f1d1d022484ff48d14056eaddaba44c443a0c02c27ac1443dca19e3117
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a malicious redirector. The document body and embedded links suggest a lure related to 'offline calling apps for android', which is likely a pretext for directing users to malicious content. The presence of a large number of external links, many pointing to Shopify domains, further supports the idea of a link farm designed to distribute malicious payloads or phish for information.

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.cc/pify?keyword=offline+calling+apps+for+android
    • http://juvogan.michelle-peterson.com/uploads/1/3/1/3/131398125/6664248.pdf
    • http://files.wegrowmicrogreens.com/uploads/1/3/2/6/132681558/dab14762d5a4.pdf
    • http://kogux.manuscriptcritiqueservices.com/uploads/1/3/0/8/130874218/jenafademus.pdf
    • http://nasobiner.spiritdrivenevents.com/uploads/1/3/2/8/132814930/mojadujiwufimexeri.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1810/files/dirafubavaririvu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0926/1217/files/ccna_voice_collaboration.pdf
    • https://cdn.shopify.com/s/files/1/0429/8850/3203/files/4760360907.pdf
    • https://cdn.shopify.com/s/files/1/0435/8370/1151/files/doxogolesutezo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7215/0947/files/animal_house_names.pdf
    • https://cdn.shopify.com/s/files/1/0431/9117/3282/files/bhagavatam_telugu_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/8221/1733/files/sejonilajedakuximefitade.pdf
    • https://cdn.shopify.com/s/files/1/0431/3242/0264/files/71556772078.pdf
    • https://cdn.shopify.com/s/files/1/0438/4607/4525/files/lapekikuguvatujeropepini.pdf
    • https://cdn.shopify.com/s/files/1/0446/3493/1363/files/veratox_aflatoxin.pdf
    • https://cdn.shopify.com/s/files/1/0432/5956/0094/files/kodak_easyshare_software.pdf
    • https://cdn.shopify.com/s/files/1/0431/1891/9837/files/kebagaz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000072ba.bin
93c1fdf36ce5742cc547b77ce2d005179b9e48d42bda211e47eb562eaed5f0cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72BA 5348 bytes
font_01_sfnt_off000084f4.bin
871109763733cf210280904570240c325117bcd4dd62e885c62bf168e8f39619		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84F4 10504 bytes

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