Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb940e1086ea2b9b…

MALICIOUS

PDF

60.3 KB Created: 2020-08-10 06:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 51d605647a032d442686c19bd03a8dac SHA-1: 27220753b386e153988dacab4f8994cd367cbc8c SHA-256: cb940e1086ea2b9b58cf71ed2ed540e682e51e2ef604d97e1bc96f8f304a431f
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'mathematics symbols' and a URL that appears to be a lure. The presence of a malicious redirector and a large number of external links suggests an attempt to drive traffic to potentially harmful sites, likely as part of a phishing or scam campaign.

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/pify?keyword=mathematics+symbols+name+pdf+download In PDF document text
    • http://nosewetiv.24hour-electricians-bridgend.co.uk/uploads/1/3/1/6/131606490/zuduxikarav-jexaf-dekepuwazumuset.pdfIn PDF document text
    • http://files.chrissellsspokane.com/uploads/1/3/1/4/131482968/dd4de61.pdfIn PDF document text
    • http://files.petersburgchurchofchrist.org/uploads/1/3/0/7/130775282/panimisalavotopab.pdfIn PDF document text
    • http://files.lakeforestcondoassn.com/uploads/1/3/0/7/130775701/vonoxupaned-mefujazin-divufalopinifob-fakupewi.pdfIn PDF document text
    • http://files.staylorhedgesart.com/uploads/1/3/1/3/131382274/f6f9677c44.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/1/0431/7511/6964/files/zugasamowixusavowo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4741/1096/files/bozaxebutokerizov.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sakemiribukewud.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/waxowakikog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/1698/5508/files/82090198065.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/669297692.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3541/9039/files/77769617137.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7969/5517/files/83114825170.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4147/9066/files/letamofifumudezizuki.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6912 5428 bytes
SHA-256: fef35035fc21e7f73474b9f24289a50837a9d463eca71cdadd9a790150a938be
font_01_sfnt_off00007b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B72 19648 bytes
SHA-256: 231bf75d4ab52dc538df3f86e14180cc33343686ab395a0eb87a2f0bcf73c50d
font_02_sfnt_off0000b925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB925 18036 bytes
SHA-256: 10b0ef7e732b38d47f6047196ce17de525f03e61be08ff69c6e9ec29530e4b6b
font_03_sfnt_off0000d567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD567 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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