Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfba0b0f37e4f250…

MALICIOUS

PDF

39.0 KB Created: 2020-08-29 20:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a1828ef3d44c18f232f0e940ba6aceb SHA-1: 0c86d2705df2f198e966b1b02670d5a2fe22837e SHA-256: cfba0b0f37e4f2504de160863caa18e1528cd635d064580f344f393d089334ed
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to a known malicious domain, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external documents, likely for SEO manipulation or to host further malicious content. No scripts were extracted, and the family is unknown.

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/wix?keyword=the+only+astrology+book+you+need
    • https://static.usrfiles.com/ugd/b8c837_115748a129394b8687d7017c60d30874.pdf
    • https://static.usrfiles.com/ugd/b8c837_b2c3427f58f145edbda03a8c7c7d935a.pdf
    • https://static.usrfiles.com/ugd/b8c837_2834814971b8414ca577aa28b115deb1.pdf
    • https://cdn.shopify.com/s/files/1/0430/5967/5293/files/the_human_centipede_full_movie_2009.pdf
    • https://cdn.shopify.com/s/files/1/0428/8148/2919/files/femilapejoruga.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/14870853296.pdf
    • https://cdn.shopify.com/s/files/1/0435/3199/3242/files/40656628461.pdf
    • https://cdn.shopify.com/s/files/1/0435/0813/8150/files/blocked_out_mills_eagles.pdf
    • https://cdn.shopify.com/s/files/1/0436/6965/1609/files/98743050514.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/3307206870.pdf
    • https://cdn.shopify.com/s/files/1/0434/0632/7975/files/werorelot.pdf
    • https://cdn.shopify.com/s/files/1/0429/3437/0470/files/chicago_bulls_news_bleacher_report.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_off00005adb.bin
0bfc2ee6089688908cf96b8fe230b80ab31ad6ca87028acba2cbc7222aadd47c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5ADB 5344 bytes
font_01_sfnt_off00006d04.bin
c25e0d6daf379b18dc4db213e30735f2e95630f2b7dc58977a33872926e732bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D04 10088 bytes