Malicious PDF — malware analysis report

Static analysis result for SHA-256 56231668a3f081a7…

MALICIOUS

PDF

68.7 KB Created: 2020-10-02 11:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f49b40c6376b1e8032227225b89d5b8f SHA-1: 9292b8c22075f370c6f231d35e4340e4739257b5 SHA-256: 56231668a3f081a78cc32d0fe7d47ccc9a87a97f36b5d4dc7ee10be7caed7aa6
154 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous embedded links, many of which point to external PDF files hosted on various domains. One prominent URL, 'https://ggtraff.ru/strik?keyword=sample+marketing+plan+format', is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms a large number of outbound links, typical of SEO spam or phishing campaigns.

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://ggtraff.ru/strik?keyword=sample+marketing+plan+format In PDF document text
    • http://zekozekod.willtaylorsite.com/uploads/1/3/0/7/130740189/pixevisowirefok.pdfIn PDF document text
    • http://files.csno.org/uploads/1/3/0/7/130775017/wezakigulina.pdfIn PDF document text
    • http://gixikoveb.jennastarfriedman.com/uploads/1/3/1/1/131164424/tenapebekuzovu-lagugepexem.pdfIn PDF document text
    • http://files.salinaseminarseries.com/uploads/1/3/2/6/132696198/fiwodilewagide.pdfIn PDF document text
    • https://site-1037211.mozfiles.com/files/1037211/80885472030.pdfIn PDF document text
    • https://site-1038395.mozfiles.com/files/1038395/3284866468.pdfIn PDF document text
    • https://site-1038690.mozfiles.com/files/1038690/83358374462.pdfIn PDF document text
    • https://site-1036775.mozfiles.com/files/1036775/xalojalakigu.pdfIn PDF document text
    • https://site-1036764.mozfiles.com/files/1036764/tixidunisumefef.pdfIn PDF document text
    • https://site-1037240.mozfiles.com/files/1037240/26872973419.pdfIn PDF document text
    • https://site-1037848.mozfiles.com/files/1037848/bitotuzuzerifu.pdfIn PDF document text
    • https://site-1036775.mozfiles.com/files/1036775/larefedonizozagukigugut.pdfIn PDF document text
    • https://site-1036926.mozfiles.com/files/1036926/mamimizemipek.pdfIn PDF document text
    • https://site-1037175.mozfiles.com/files/1037175/vujezabozolajiwob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0484/4404/7528/files/86952732478.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/8206/7357/files/time_set_minecraft_night.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2136/8472/files/mario_kart_online_unblocked.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0483/4839/7721/files/ancient_media_and_persia_map.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C5 5000 bytes
SHA-256: 4963695f12876bfaf8dcf48c5cd23c03580732204f24ac6c976868dd0d59f9d2
font_01_sfnt_off0000d3aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AA 10328 bytes
SHA-256: b65ae126e11a39aeafab67e4ea07ab41aa42b5c99e69fe501c5c9aeb3e4603a9
font_02_sfnt_off0000f701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF701 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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