Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4bb290d9030f7b…

MALICIOUS

PDF

42.8 KB Created: 2020-08-05 11:19:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80664ab6bb7378fd0d104d449d9ebdc5 SHA-1: 429f4923a9c4e82c210cb02e41d55e0d6300ffd1 SHA-256: 5a4bb290d9030f7b2a98ce427ca103efc78b14e1f5abff41203efba9bbc52e0b
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://ttraff.ru/pify?keyword=willingness+to+pay+definition+pdf', is flagged as a malicious redirector. The document body, though partially corrupted, contains the text 'Willingness to pay definition pdf' and the malicious URL, indicating a lure to a potentially harmful site. The ML classifier also strongly flagged this PDF as malicious.

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=willingness+to+pay+definition+pdf
    • http://files.kacihollingsworth.com/uploads/1/3/1/3/131381605/sikewolerosodanad.pdf
    • http://files.georgiaraefamilyband.com/uploads/1/3/1/4/131405977/rigizufe.pdf
    • http://files.xminimumy.com/uploads/1/3/1/4/131437044/5213490.pdf
    • http://files.letrim.com/uploads/1/3/1/1/131164250/8ca155cd6deb1d1.pdf
    • http://files.bluebayoudesigns.com/uploads/1/3/0/8/130814205/fesepifufugozun_soterofidire_jisabilufuv_ripekusita.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3251/8555/files/nevegofewobidiwur.pdf
    • https://cdn.shopify.com/s/files/1/0428/5893/8531/files/adjetivos_calificativos_en_francs.pdf
    • https://cdn.shopify.com/s/files/1/0437/1572/3414/files/81903458313.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/55864873889.pdf
    • https://cdn.shopify.com/s/files/1/0433/6222/2232/files/20353116438.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7261/files/stellar_drive_clone.pdf
    • https://cdn.shopify.com/s/files/1/0431/4116/9303/files/bifibatikakopovugove.pdf
    • https://cdn.shopify.com/s/files/1/0438/1189/7504/files/17717397424.pdf
    • https://cdn.shopify.com/s/files/1/0428/7715/7542/files/lapejepupudizuwiboguboliv.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1031/files/58803738275.pdf
    • https://cdn.shopify.com/s/files/1/0437/9816/7713/files/62278552131.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_off00006859.bin
64b886d88193f597cef1b1e991e3451fa53807921381254de2cb23140ff0159b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6859 5228 bytes
font_01_sfnt_off00007a55.bin
48304cc64c121fd1a3b7c7b8a8d807cd6ac2594bdd46b22c828d2fe22400970f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A55 10556 bytes

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