Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0b10e0cbaef2c4…

MALICIOUS

PDF

47.8 KB Created: 2020-11-03 03:10:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1b9f6fd1a481c8b7abf14c4e86e3b256 SHA-1: 960d8415bab87c449c67ba908c85a96ba675792c SHA-256: 4b0b10e0cbaef2c46551021fa77d26a70500eabba832a45b8054df4101c14d49
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's a malicious redirector and link farm, designed to direct users to external sites. The embedded URL 'https://ggtraff.ru/strik?keyword=wow+classic+summoning+stones+not+working' is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, reinforcing the lure.

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://ggtraff.ru/strik?keyword=wow+classic+summoning+stones+not+working In PDF document text
    • https://cdn-cms.f-static.net/uploads/4393186/normal_5f929ead95975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410965/normal_5f974e46a1a43.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384644/normal_5f9a9e286cf5a.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/dinisemowoge/eve_online_beginners_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/kelazazuxatoroxuset.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/cryan_shames_band.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0493/0168/4383/files/door_slammers_2_cheats_free_gold.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/alok_ranjan_dasgupta_kobita_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/758a6ac3-531b-41e6-94cf-44ec7af88d0c/monaxakekinomaremasi.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7102 5288 bytes
SHA-256: f492df2120cc5600e93f68ed6f6ac57039c36cf68d6deb5a69d21a2656beac50
font_01_sfnt_off00008301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8301 3720 bytes
SHA-256: d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281
font_02_sfnt_off00008e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E65 10372 bytes
SHA-256: 1a2280c1ef36e16e24b405c2b4296441bee6fe194f2e1d4cb8fc6d47d876d5a7