Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a954b2fb9d7f222…

MALICIOUS

PDF

53.0 KB Created: 2020-10-16 02:35:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4d9f0d613c8e3808b189d12c5e0656e7 SHA-1: 60013b00d40e8356b1723b3959e9c3c503a61916 SHA-256: 8a954b2fb9d7f222aa3f43a92bd6c799747de11b84508d37e11c6d8203049c15
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or SEO spam campaign, aiming to direct users to malicious infrastructure.

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://gettraff.ru/123?keyword=septic+shock+hemodynamic+resuscitation+guidelines In PDF document text
    • https://site-1038636.mozfiles.com/files/1038636/88509329089.pdfIn PDF document text
    • https://site-1039965.mozfiles.com/files/1039965/widenijavokebaritixilixi.pdfIn PDF document text
    • https://site-1043406.mozfiles.com/files/1043406/75931256201.pdfIn PDF document text
    • https://site-1040037.mozfiles.com/files/1040037/jutafajapidoxirugolexigu.pdfIn PDF document text
    • https://taxajadotediru.weebly.com/uploads/1/3/0/8/130873824/xumavefodomagaw_vanogufuwarapo_nopokakakamu.pdfIn PDF document text
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/666c4a.pdfIn PDF document text
    • https://zesopupejilit.weebly.com/uploads/1/3/0/7/130738861/0ee11d9d1e6ecd.pdfIn PDF document text
    • https://site-1039301.mozfiles.com/files/1039301/jazifuviwoni.pdfIn PDF document text
    • https://site-1039902.mozfiles.com/files/1039902/3836804240.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/beparinunij.pdfIn PDF document text
    • https://rijizego.weebly.com/uploads/1/3/0/7/130776487/80e886.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1409/4487/files/loterisuzaxajilumudowev.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8865/0146/files/5333432335.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4116/3926/files/gta_flying_bike_cheat.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9364/2395/files/69755329425.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/3550/7358/files/turipawutosotofunef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6664/1570/files/duwewida.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0479/3833/8972/files/magicjack_mod_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0342/7993/files/44149201739.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D27 5756 bytes
SHA-256: b9b9e31ec446a4faed4b1dfcbea114a8f4dc0b89c281ecd08f7103bddb7649b3
font_01_sfnt_off0000a099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA099 10980 bytes
SHA-256: 6ef9a3feede19b40fd3437df6d1fe423610f105e946d7dc227aa7bae78f825f2

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