Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae5dee248a0c2cc…

MALICIOUS

PDF

40.9 KB Created: 2020-08-23 14:10:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd99c8606421bfce464a4c6606aa0e7b SHA-1: 64c389d37f47e8b8defc39f33fc3a0e6061b7fb3 SHA-256: 7ae5dee248a0c2cc268011f4c2955a6d52e6bf62adc6c902279530f6e29761a0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to a link farm designed to redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body itself is largely unreadable, but the presence of the malicious URL is a strong indicator of a phishing or redirection attack.

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.ru/pify?keyword=xerostomia+definicion+pdf
    • http://wonujemi.womensoutdoorweekends.co.uk/uploads/1/3/1/3/131379678/wusejudizuje.pdf
    • http://xanopa.samanthabowick.com/uploads/1/3/1/4/131438464/5990896.pdf
    • http://files.stoneworkswellness.com/uploads/1/3/1/6/131637136/2657587.pdf
    • http://kodogojek.feliceabarr.com/uploads/1/3/0/7/130738666/pululit-girif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5545/6149/files/faguse.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94448736580.pdf
    • https://cdn.shopify.com/s/files/1/0433/3505/7559/files/bafeb.pdf
    • https://cdn.shopify.com/s/files/1/0436/0473/8206/files/ramololinal.pdf
    • https://cdn.shopify.com/s/files/1/0428/2531/8563/files/92853466130.pdf
    • https://cdn.shopify.com/s/files/1/0434/6737/4758/files/tajur.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/28314381484.pdf
    • https://cdn.shopify.com/s/files/1/0431/3694/2234/files/ing_direct_australia.pdf
    • https://cdn.shopify.com/s/files/1/0430/6409/8970/files/saxunagemufevodedetavasu.pdf
    • https://cdn.shopify.com/s/files/1/0429/1536/5031/files/dajazezupadex.pdf
    • https://cdn.shopify.com/s/files/1/0438/4423/9510/files/que_es_una_carga_electrica.pdf
    • https://cdn.shopify.com/s/files/1/0432/8253/0472/files/vonixijizotosaxikisut.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006304.bin
68c156cc5257b66d2c74253b3a7383e3bec37ab5c38afe105d43f0f941dce302
pdf-font-stream PDF embedded font (sfnt) at offset 0x6304 5248 bytes
font_01_sfnt_off000074be.bin
2b7421801bf634453d134965452bec24bf78a05268db99ea5350e3b70d03018e
pdf-font-stream PDF embedded font (sfnt) at offset 0x74BE 10020 bytes