Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b19587465d5667f…

MALICIOUS

PDF

46.6 KB Created: 2020-08-13 21:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b94a0100234c5da98deca7bb5029353 SHA-1: 08310da09f3c011a944e5f524889319c66255440 SHA-256: 8b19587465d5667fb8519f25d1e63e2780e0b35629a940338b2213142f3a4dcf
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, contains text related to 'Harpsicle sheet music' and a URL that appears to be part of a link farm designed to attract traffic. The primary malicious URL identified is https://ttraff.com/pify?keyword=harpsicle+sheet+music, which is likely used to redirect users to further 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=harpsicle+sheet+music
    • http://files.shinenewagemedia.com/uploads/1/3/2/6/132683252/6432064.pdf
    • http://files.classicalmusictoday.net/uploads/1/3/1/0/131069934/nitipagapana-zujatitutekef-nupiw.pdf
    • http://files.thoughtsinpoetry.com/uploads/1/3/1/6/131606165/migedemif.pdf
    • https://cdn.shopify.com/s/files/1/0441/1670/5432/files/why_is_my_text_red_in_discord.pdf
    • https://cdn.shopify.com/s/files/1/0434/0537/7701/files/17182187153.pdf
    • https://cdn.shopify.com/s/files/1/0433/7719/7221/files/11466602929.pdf
    • https://cdn.shopify.com/s/files/1/0432/9986/4734/files/zigivoj.pdf
    • https://cdn.shopify.com/s/files/1/0434/1130/8696/files/39345041388.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/sezuvigozetafifigalunid.pdf
    • https://cdn.shopify.com/s/files/1/0450/9371/6121/files/allison_transmission_codes.pdf
    • https://cdn.shopify.com/s/files/1/0431/5083/5878/files/folotetewenarewetabason.pdf
    • https://cdn.shopify.com/s/files/1/0429/0668/1497/files/best_architect_cv.pdf
    • https://cdn.shopify.com/s/files/1/0441/0081/2952/files/12348678566.pdf
    • https://cdn.shopify.com/s/files/1/0427/7154/6279/files/xuruma.pdf
    • https://cdn.shopify.com/s/files/1/0439/4962/1416/files/characteristics_of_computer_network_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/90648591148.pdf
    • https://cdn.shopify.com/s/files/1/0433/4108/6888/files/33098377230.pdf
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/philips_universal_remote_control.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_off00007629.bin
71d815c570a55378959e8911ecfb062ac02acd83101db1169f56a3b025ddd7ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7629 5136 bytes
font_01_sfnt_off0000876e.bin
8044d1f6ca33d9c71517fd329dafa683c6fbc8b804147007193f454b8c9310e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x876E 11140 bytes

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