PDF malware analysis — malicious · 535c76468b30c8fb

MALICIOUS

PDF

47.7 KB Created: 2020-10-27 07:41:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01

MD5: 68c1850e20d86990e14d2a795c75a070 SHA-1: d17d51d898ce9379a637b831e693345bdf49671f SHA-256: 535c76468b30c8fb44db2fc8bd0175034bc7b2cd3eb2113092f95608b8575109

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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=t+torrent+apk In PDF document text
- https://cdn-cms.f-static.net/uploads/4408712/normal_5f952f94695e7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4386080/normal_5f9255a6a664a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4378848/normal_5f8a55e88cf5f.pdfIn PDF document text
- https://dojulukasinu.weebly.com/uploads/1/3/0/7/130776790/puvixerizewatul.pdfIn PDF document text
- https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/f5e09a731.pdfIn PDF document text
- https://vilukenuxe.weebly.com/uploads/1/3/2/8/132814007/f271163d37fbca5.pdfIn PDF document text
- https://ximazula.weebly.com/uploads/1/3/0/7/130738777/8560432.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/1/0430/4715/7914/files/fawumivozulegoj.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0505/6249/8754/files/desperado_ukulele_chords.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0499/9692/3040/files/xogukofimanokebepasataka.pdfIn PDF document text
- https://s3.amazonaws.com/xeroguru/toxerumafezabufapikul.pdfIn PDF document text
- https://s3.amazonaws.com/waxapoz/rilisijopebosozexiwe.pdfIn PDF document text
- https://s3.amazonaws.com/vezumobigodub/wobet.pdfIn PDF document text
- https://s3.amazonaws.com/jazuravazaguz/55000122132.pdfIn PDF document text
- https://s3.amazonaws.com/jamokaroxoj/lewis.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0501/1682/1157/files/role_of_finance_manager.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0497/9851/2803/files/tsum_tsum_auto_send_hearts_android.pdfIn PDF document text
- https://s3.amazonaws.com/kikunojulejuj/recent_trends_in_educational_psychology.pdfIn PDF document text
- https://s3.amazonaws.com/nijudow/inner_bonding_worksheet.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00006706.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6706	4616 bytes
SHA-256: `44cb9c91a6ac8112ddd1f24a0d51265e6e1fdc4ae3192a8ff7c55e075075989f`
`font_01_sfnt_off000076c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x76C1	10972 bytes
SHA-256: `6f145155cee592b02f6d90039780e5bae368169a67d439fceca13f177361194b`
`font_02_sfnt_off00009c79.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9C79	16204 bytes
SHA-256: `e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15`

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