Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea0e209fd5f39a3…

MALICIOUS

PDF

43.5 KB Created: 2020-08-11 16:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8120157aaa177fe6046515503802b1e SHA-1: 05c42a847b165dd6ad8fdc9d90e6583e32be2065 SHA-256: 6ea0e209fd5f39a3bcfecc6aaba2c2d7b1c005fc4db696b243c6a0f11504594c
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 a link farm designed to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the presence of a redirector link further supports this. The document body, though partially corrupted, contains text related to 'auditing and assurance services' and the wkhtmltopdf tool, suggesting a lure to disguise the malicious link farm.

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=auditing+and+assurance+services+in+australia+pdf
    • http://xapuza.sapritalia.com/uploads/1/3/0/7/130738914/dimuri.pdf
    • http://files.nouvellegraphicdesign.com/uploads/1/3/1/8/131856703/tobegegijew-zejomogepoz-xurixevukewan-fejufuguvo.pdf
    • http://files.matangold.com/uploads/1/3/0/9/130969358/gunet_jebov_wurisor_boxepegiraziruf.pdf
    • http://files.benstonaker.com/uploads/1/3/1/4/131437683/menomatawij.pdf
    • http://files.daviswaterconditioning.com/uploads/1/3/1/3/131378771/880820.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/7741/8651/files/56778952775.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/potiwabuvufepatene.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4498/files/fulevere.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/30817534283.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/banen.pdf
    • https://cdn.shopify.com/s/files/1/0433/6300/8661/files/94789432037.pdf
    • https://cdn.shopify.com/s/files/1/0433/6130/4728/files/kotuzu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7034/files/1356741019.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/luzugojozawok.pdf
    • https://cdn.shopify.com/s/files/1/0433/3859/6510/files/mysql_foreign_key.pdf
    • https://cdn.shopify.com/s/files/1/0428/1548/8163/files/87897493687.pdf
    • https://cdn.shopify.com/s/files/1/0432/1542/1600/files/backstage_cs_8000.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_off00006a7c.bin
5c5c77569e294a8728c63550788240f285e65906a1e73f6287b4bff5699554d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A7C 5372 bytes
font_01_sfnt_off00007cd0.bin
c5758fffdce0dc632fce31fdb627efeb43990d0421d6bc1a54269796ba8d5d59		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD0 10636 bytes

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