PDF malware analysis — malicious · 70a48894246cf479

MALICIOUS

PDF

44.0 KB Created: 2020-10-28 09:50:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14

MD5: 659be23dc1f60d0d0114d8c9fa64011e SHA-1: ea04e4d5e43d5b9a0799f9528fd7d417fa70f76d SHA-256: 70a48894246cf47922c6344883b961660226fe37cdb993ff138bcb4908463e60

194 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics as malicious, specifically for containing links to known malicious redirectors and a large number of external PDF links, indicative of SEO spam. The document body, though heavily obfuscated, contains a URL that aligns with the observed malicious infrastructure. The primary attack pattern involves luring users to malicious websites through deceptive content.

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.
Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK

PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
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.ru/123?keyword=factoring+cubic+polynomials+with+3+terms In PDF document text
- https://fajagewuw.weebly.com/uploads/1/3/4/3/134350503/bezepulituna.pdfIn PDF document text
- https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/3534a.pdfIn PDF document text
- https://julasunanuk.weebly.com/uploads/1/3/4/3/134308365/d961090c7.pdfIn PDF document text
- https://kemumapuvepuvi.weebly.com/uploads/1/3/4/3/134311950/78beaa618c08064.pdfIn PDF document text
- https://zenisitidijo.weebly.com/uploads/1/3/4/3/134309999/8597759.pdfIn PDF document text
- https://kiroteveve.weebly.com/uploads/1/3/4/3/134378898/vevun_wivew.pdfIn PDF document text
- https://tedumuwoke.weebly.com/uploads/1/3/1/3/131397970/mozit.pdfIn PDF document text
- https://pubetisor.weebly.com/uploads/1/3/4/3/134348812/lenawabefirugesan.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/nawuvud/kulujerasadimanoluzu.pdfIn PDF document text
- https://s3.amazonaws.com/susopuzupure/mezavujujadabosag.pdfIn PDF document text
- https://s3.amazonaws.com/guvovigo/guia_autometrica_marzo_2019.pdfIn PDF document text
- https://s3.amazonaws.com/numegubowalonan/cashless_economy_advantages_and_disadvantages.pdfIn PDF document text
- https://s3.amazonaws.com/fasanag/ambarella_s5.pdfIn PDF document text
- https://s3.amazonaws.com/lixasifasi/46154735942.pdfIn PDF document text
- https://s3.amazonaws.com/fowikorejodi/3507164028.pdfIn PDF document text
- https://s3.amazonaws.com/jifesu/bakupiwosopidema.pdfIn PDF document text
- https://s3.amazonaws.com/sowewazulejewi/branding_vs_marketing.pdfIn PDF document text
- https://s3.amazonaws.com/henghuili-files/advanced_integral_calculus_by_dc_agarwal_free_download.pdfIn PDF document text
- https://s3.amazonaws.com/fekaduvopigab/91870425221.pdfIn PDF document text
- https://s3.amazonaws.com/zemigiduwagafu/18623558616.pdfIn PDF document text
- https://s3.amazonaws.com/panokojol/vertical_and_horizontal_analysis_of_financial_statements.pdfIn PDF document text
- https://s3.amazonaws.com/tutapaxi/cardinal_numbers_exercises_for_adults.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.

Filename	Kind	Source	Size
`font_00_sfnt_off000067f2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x67F2	5800 bytes
SHA-256: `8d8c25a99627f312e06679acdd1caf563c0c526e30412093f38dfc02f6e2ab89`
`font_01_sfnt_off00007b9d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7B9D	11412 bytes
SHA-256: `08f37ca5f9fd1b74c08b2907138ae2f47e8f6a0c8f1f33247500ee62238a514a`

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