Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a623bbd842b99e4…

MALICIOUS

PDF

53.9 KB Created: 2020-08-12 10:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2a6ad32c5f051226ac841aad9a61e78 SHA-1: 3b1e5dd45f93e36231dfaa75378eed6d29c26585 SHA-256: 4a623bbd842b99e419db58829b7e871f89259f57f454fd590a77fcab58a08491
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link, specifically 'https://ttraff.ru/pify?keyword=for+the+first+time+piano+sheet+music+pdf'. This link is likely part of a phishing or malware distribution scheme. The document also exhibits characteristics of a PDF SEO link farm, with numerous embedded links pointing to various PDF files, many hosted on Shopify. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/pify?keyword=for+the+first+time+piano+sheet+music+pdf
    • http://files.ghvmsband.org/uploads/1/3/0/7/130775518/ebe25b12d46.pdf
    • http://files.antonybolante.com/uploads/1/3/0/7/130776644/7945403.pdf
    • http://varosub.thinkdifferentgomez.com/uploads/1/3/0/7/130776445/606969.pdf
    • http://files.modernhomebuyers.us/uploads/1/3/0/7/130738524/3024126.pdf
    • http://dujanogog.islandcitypublishing.com/uploads/1/3/1/6/131606490/tukokesidozuzuxit.pdf
    • https://cdn.shopify.com/s/files/1/0434/7189/6736/files/essential_grammar_in_use_supplementary_exercises_fourth_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/35378773692.pdf
    • https://cdn.shopify.com/s/files/1/0434/6963/5746/files/50779075333.pdf
    • https://cdn.shopify.com/s/files/1/0435/6089/4627/files/12035215518.pdf
    • https://cdn.shopify.com/s/files/1/0431/2216/3876/files/mipibefuje.pdf
    • https://cdn.shopify.com/s/files/1/0433/9413/8277/files/bukoludozowunipuranojedup.pdf
    • https://cdn.shopify.com/s/files/1/0438/1586/2434/files/minecraft_puzzle_maps_3_player.pdf
    • https://cdn.shopify.com/s/files/1/0428/8921/6163/files/40460541404.pdf
    • https://cdn.shopify.com/s/files/1/0430/9037/8909/files/vexevexixed.pdf
    • https://cdn.shopify.com/s/files/1/0434/2690/6264/files/gisugozazozogotegoka.pdf
    • https://cdn.shopify.com/s/files/1/0433/3905/5253/files/lirotusesevobatizelodiwin.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007399.bin
cd0d1e75fcec8eb538958cc2ef7fa540ec297f094eb3dcf5f8d2fc481298f664		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7399 5200 bytes
font_01_sfnt_off0000851d.bin
40e3ab0bcac36e542f94ca6dbe7bababdb7a3ee586d2809e54e1ff9d77b7ea55		 pdf-font-stream PDF embedded font (sfnt) at offset 0x851D 9860 bytes
font_02_sfnt_off0000a71a.bin
d973db94ba2c448c661c26f08d051ac794e7cb4f3c7daa33c2141e8036f071b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA71A 16100 bytes
font_03_sfnt_off0000bbe8.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBE8 4324 bytes

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