Malicious PDF — malware analysis report

Static analysis result for SHA-256 897e0b118e40b13b…

MALICIOUS

PDF

37.0 KB Created: 2020-08-22 12:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a33b6cdb1acaa4a99ef46a4ef31d7d6b SHA-1: d447ca22c40ecc9e86d3e1c2fa1616e075fdf177 SHA-256: 897e0b118e40b13bc6358c24b881ab4917b4610f7c349f59df360e12e29b762a
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=shakespeare+in+love+soundtrack', suggesting a lure to a site that likely hosts malicious content or phishing pages. The presence of many Shopify links indicates a link farm strategy.

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=shakespeare+in+love+soundtrack
    • http://files.cbenglish.com/uploads/1/3/1/4/131437532/8c3151d4e2a.pdf
    • http://files.sanfordwelcomecenter.com/uploads/1/3/1/4/131453484/d77bf1d43.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5511/9520/files/9420782892.pdf
    • https://cdn.shopify.com/s/files/1/0427/7361/0663/files/sigebis.pdf
    • https://cdn.shopify.com/s/files/1/0428/3822/9158/files/41674988342.pdf
    • https://cdn.shopify.com/s/files/1/0434/6521/2066/files/high_alumina_cement.pdf
    • https://cdn.shopify.com/s/files/1/0430/4325/8519/files/44640046140.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/case_files_pediatrics_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0440/1912/2341/files/bahishti_zewar_free_download_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wofizafadunemewu.pdf
    • https://cdn.shopify.com/s/files/1/0427/5824/2470/files/xufulokaxapogimu.pdf
    • https://cdn.shopify.com/s/files/1/0430/2707/1130/files/mivawadegujifegirevuvij.pdf
    • https://cdn.shopify.com/s/files/1/0434/6127/9894/files/causes_of_abnormal_psychology.pdf
    • https://cdn.shopify.com/s/files/1/0435/5158/8507/files/3580696538.pdf
    • https://cdn.shopify.com/s/files/1/0431/5856/9120/files/collapse_of_ottoman_empire.pdf
    • https://cdn.shopify.com/s/files/1/0429/7244/6873/files/favodobuletod.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_off000051fd.bin
0952c49d98410c36dee191049ed0ab44ada552f5372d3254c7d19729b0224eb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51FD 5388 bytes
font_01_sfnt_off00006445.bin
7331385c91ca56fcc6b49959ba294d0dfdc7472f5680580cc15480b14446ed3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6445 9804 bytes

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