Malicious PDF — malware analysis report

Static analysis result for SHA-256 656ec8711ca28049…

MALICIOUS

PDF

34.9 KB Created: 2020-08-30 10:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b61724592a1f0f74f0fa47b0f6a7df5e SHA-1: 6df4c913b427fb8a98f0f90f8d3f0cb43218a0b7 SHA-256: 656ec8711ca2804973da8d5e2dcbe60a622089a7df7f7cdcdd040090b7d5372b
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to benign Shopify domains, but one critical link to 'ttraff.ru' is identified as a malicious redirector. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/wix?keyword=karma+yoga+pdf+free+download', suggesting a lure for free downloads that redirects to malicious infrastructure. No scripts were extracted, but the presence of a malicious redirector and the link farm pattern indicate a high likelihood of user redirection to malicious content.

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=karma+yoga+pdf+free+download
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3853/8904/files/the_sharpest_lives_tab.pdf
    • https://cdn.shopify.com/s/files/1/0438/4843/3829/files/67375974236.pdf
    • https://cdn.shopify.com/s/files/1/0428/9904/6553/files/dozunevofakeguse.pdf
    • https://cdn.shopify.com/s/files/1/0433/9613/7111/files/perspectiva_isometrica_ejercicios_resueltos.pdf
    • https://static.usrfiles.com/ugd/9e41f0_222a088394d9417d9d6d1f7bd2032b98.pdf
    • https://static.usrfiles.com/ugd/accd1f_53b9a55571c3453c92b67ada0ae7ae6c.pdf
    • https://static.usrfiles.com/ugd/9421c8_70ce423490ab4fa4ba2d0147b430558e.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e4350b43ae547118527007f65489b33.pdf
    • https://static.usrfiles.com/ugd/0c4177_00d1a63fc73844089456ce284cfc5649.pdf
    • https://cdn.shopify.com/s/files/1/0431/2884/8538/files/44695664228.pdf
    • https://cdn.shopify.com/s/files/1/0431/2468/7014/files/nuxozofujujariwejibosu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1922/9591/files/java_remove_element_from_array.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96989945255.pdf
    • https://cdn.shopify.com/s/files/1/0429/2050/9596/files/9101439209.pdf
    • https://static.usrfiles.com/ugd/a44510_c3db0806ad2e49d59ed50552f2acfe0d.pdf
    • https://static.usrfiles.com/ugd/b8c837_4367d6e7959444888b34f8d1c335fcca.pdf
    • https://static.usrfiles.com/ugd/e33828_74bf8fcaa8234a9193a9555b7d3f6179.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_off00004a71.bin
0a44ce4ccec39126605c8953ea206a4a5bc95516da55974fc600f98328cbe068		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A71 5348 bytes
font_01_sfnt_off00005caf.bin
ccdc96526df161cf689d76f962a7301c62764c48feec9a3140442ca43bd1dcf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAF 9992 bytes

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