Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a8708b7f80f028…

MALICIOUS

PDF

42.1 KB Created: 2020-08-12 10:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff8ef336d4cc306b0cd6eb0e7f77af53 SHA-1: 2a1d0a803532c13c77e90c9db043ec2bd3b7a280 SHA-256: 08a8708b7f80f0286f1e6ea05964c9b8d04895849cf9d901bf517a23fe7378fd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as a file conversion tool. It also features a large number of external links, many pointing to Shopify, suggesting a link farm for SEO manipulation or to host further malicious content. The ML classifier strongly indicates maliciousness, and the embedded URLs are the primary indicators of compromise.

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.com/wb?keyword=convert%20epub%20to%20pdf%20file
    • http://files.nicoleuphotos.com/uploads/1/3/0/7/130776725/rikuravijumuvi-wutepato.pdf
    • http://zixev.pawneecityboe.com/uploads/1/3/1/0/131070718/4624113.pdf
    • http://files.apowersphotography.com/uploads/1/3/1/1/131164479/13b06.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/9699/0105/files/historia_del_almacenamiento_en_la_nube.pdf
    • https://cdn.shopify.com/s/files/1/0431/9395/8560/files/59753413083.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/84873408505.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/xevazivukofe.pdf
    • https://cdn.shopify.com/s/files/1/0428/5369/5647/files/banaxolitiwolefixaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/8937/9993/files/regex_non_greedy.pdf
    • https://cdn.shopify.com/s/files/1/0431/9212/3553/files/el_banquete_de_platon_ensayo.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6341/files/tirare.pdf
    • https://cdn.shopify.com/s/files/1/0427/9464/7719/files/bibeze.pdf
    • https://cdn.shopify.com/s/files/1/0432/4786/1923/files/bsc_physics_syllabus_gauhati_university.pdf
    • https://cdn.shopify.com/s/files/1/0434/1324/2005/files/muwunobimilumunadosiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/0206/1215/files/strategic_planning_examples.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053f1.bin
ed4aa8597cb37cee4690b3bfb1674aa26c6fa80c102ff26412023b4ce20988aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53F1 4752 bytes
font_01_sfnt_off00006424.bin
3a902407ddce1959b6b8614ddf31c4ceb3bb4148c4c8a7a7e35d5de3ab69bda5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6424 9968 bytes
font_02_sfnt_off00008692.bin
f283a563ee48c68d0f210b91d059b93f2da97875a4894e08c15e1f8ed5b97a7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8692 16076 bytes

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