Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b8c9bf43c07a6c7…

MALICIOUS

PDF

46.6 KB Created: 2020-08-07 02:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a437dbf9d7de48e33dba3e60f719c14 SHA-1: b21d844d2ce804910c6403621bbee1762fe7d8f2 SHA-256: 5b8c9bf43c07a6c7ed3b96022ef26f47c60485ddf7daa98d5af56e09f0d980ce
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one identified as a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt, likely to obscure the true malicious destination. The document body, though heavily obfuscated, contains the malicious URL.

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.ru/pify?keyword=telur+ascaris+lumbricoides+pdf
    • http://files.jeremymahood.com/uploads/1/3/0/7/130739163/6003871.pdf
    • http://xawezewo.creative-soul-coaching.com/uploads/1/3/1/4/131408027/7502525.pdf
    • http://bedozo.rachaeldzikonski.com/uploads/1/3/1/4/131453133/popoxes_bapafolasugupa_kebati.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/8208/7576/files/sufuvutaz.pdf
    • https://cdn.shopify.com/s/files/1/0431/9900/4831/files/microelectronic_circuits_7th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/3391/0681/files/cool_math_jacksmith.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/26696981208.pdf
    • https://cdn.shopify.com/s/files/1/0438/4089/7174/files/89303132212.pdf
    • https://cdn.shopify.com/s/files/1/0433/8424/2337/files/bumubajuge.pdf
    • https://cdn.shopify.com/s/files/1/0438/3696/5026/files/nifuba.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/84430553064.pdf
    • https://cdn.shopify.com/s/files/1/0433/6399/1717/files/zasitekepoxa.pdf
    • https://cdn.shopify.com/s/files/1/0440/1538/6789/files/57153780338.pdf
    • https://cdn.shopify.com/s/files/1/0434/0023/3110/files/77570559174.pdf
    • https://cdn.shopify.com/s/files/1/0427/9320/5916/files/gezodifoposodegefot.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ba4.bin
5dd5460ea23300640d2ed20505f0e8fa66d10ec962b79612bc23b6941f2c7955		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA4 5084 bytes
font_01_sfnt_off00007cdb.bin
520fe7d715c4f44920d5c5ab259da9398b98054fd361179f10eee07f3481d50a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CDB 10116 bytes
font_02_sfnt_off00009f79.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F79 4324 bytes

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