Malicious PDF — malware analysis report

Static analysis result for SHA-256 73c2359d549e4e43…

MALICIOUS

PDF

35.4 KB Created: 2020-09-12 12:11:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bff23122bcead342147e31e26ae3617 SHA-1: 9b4c5091499f7ffdf979da9de4ab6dcb6c1737f2 SHA-256: 73c2359d549e4e43a7007a74939605e4ccecff8956c3407a8a05994aa446c9b2
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to 'sheet music' and a URL that appears to be part of a link farm. The presence of embedded links and the redirector heuristic suggest an attempt to lead the user to a malicious site, likely for phishing or malware distribution.

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.me/wix?keyword=bigmouth+strikes+again+sheet+music
    • http://files.thegreatdivepodcast.com/uploads/1/3/0/7/130776054/87ebe39b.pdf
    • http://files.baroque-encounter.com/uploads/1/3/0/8/130813409/6912995.pdf
    • http://zebaba.fresnofools.com/uploads/1/3/0/7/130738870/27265b489bbb.pdf
    • http://files.shabdapress.com/uploads/1/3/1/3/131378975/7168772.pdf
    • http://files.mbsportnutritionnetwork.org/uploads/1/3/1/0/131070351/ruzosowud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5376/9126/files/volitional_form_english.pdf
    • https://cdn.shopify.com/s/files/1/0433/7011/9318/files/dazadebivurojogaramajedem.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/25926923177.pdf
    • https://cdn.shopify.com/s/files/1/0433/4639/5304/files/mubepikaviziporipapepofeb.pdf
    • https://cdn.shopify.com/s/files/1/0438/1832/0034/files/jizulefozamabaposinorir.pdf
    • https://static.usrfiles.com/ugd/8acad3_2371cc63325d4c66a019f2fde58472e0.pdf
    • https://static.usrfiles.com/ugd/906e9f_b4542d68c9004fb7b5b08b1c950ab5da.pdf
    • https://cdn.shopify.com/s/files/1/0431/4421/6730/files/php_scrape_html.pdf
    • https://cdn.shopify.com/s/files/1/0444/2993/4758/files/aitsl_teaching_standards.pdf
    • https://cdn.shopify.com/s/files/1/0438/5066/2053/files/smartsheet_stock_value.pdf
    • https://cdn.shopify.com/s/files/1/0434/5593/8720/files/xiwiminukulebixijelajo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b96.bin
911db321d9d785449534b2d5829105eb699766b96c2ef8d14916267ad11eea68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B96 5296 bytes
font_01_sfnt_off00005d75.bin
ed941d28f836aeeb61d7fe39b8e061f7b5959df5e5bdf3c91085bd85d25af80e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D75 10284 bytes

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