Malicious PDF — malware analysis report

Static analysis result for SHA-256 c331b3ba91dcd788…

MALICIOUS

PDF

50.9 KB Created: 2020-08-09 20:50:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c89972f3127e2f557ce16dc90dc0a3ab SHA-1: ba5c5454491cd170bf0ae830cc9f19dcf7577c56 SHA-256: c331b3ba91dcd788987ab1fa18a0503824f4e34a82172748c7cb488aa28666b8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains numerous links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the string 'Batman hush comic pdf' and the malicious URL, suggesting a lure to trick users into downloading malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful sites.

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=batman+hush+comic+pdf
    • http://files.myroamingspirit.me/uploads/1/3/0/7/130776483/gilezekejef-rusen.pdf
    • http://files.dagazliving.com/uploads/1/3/2/6/132696171/e1dc5aa9.pdf
    • http://files.placentaedmonton.ca/uploads/1/3/0/8/130874433/dosoraj.pdf
    • https://cdn.shopify.com/s/files/1/0430/8205/5842/files/cch_sng_inamori_kazuo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7939/1646/files/27175554354.pdf
    • https://cdn.shopify.com/s/files/1/0432/5064/7202/files/68806927182.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/40028387725.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5663/files/gamabubikofirepikajofa.pdf
    • https://cdn.shopify.com/s/files/1/0443/0639/9388/files/sejarah_ahmadiyah_di_indonesia.pdf
    • https://cdn.shopify.com/s/files/1/0437/5199/7592/files/eaten_alive_1980.pdf
    • https://cdn.shopify.com/s/files/1/0433/5868/3291/files/29477024209.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/que_es_preeclampsia.pdf
    • https://cdn.shopify.com/s/files/1/0437/6307/3181/files/vezakologomosexorijek.pdf
    • https://cdn.shopify.com/s/files/1/0439/3825/0910/files/ily_meaning_text.pdf
    • https://cdn.shopify.com/s/files/1/0428/8079/4790/files/4994746887.pdf
    • https://cdn.shopify.com/s/files/1/0439/9392/3742/files/35688956849.pdf
    • https://cdn.shopify.com/s/files/1/0434/3837/5074/files/niguwovokovuf.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_off00008af4.bin
e6c08f6d6801e395bd930fd472bb30e9caf70a183e3c5fffdb0667e4a5df9eff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AF4 5316 bytes
font_01_sfnt_off00009ceb.bin
221c216f464b2685767437a3d94e668d85b3c3f0222e989a01553d6e58e1f629		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9CEB 9996 bytes

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