Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad1722e0d971996…

MALICIOUS

PDF

47.3 KB Created: 2020-08-07 16:17:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbf5e0c79fec245f83bedc30512567f6 SHA-1: f7a8fe8adc503dc2d4e39be8d445c095aa30e0e5 SHA-256: 5ad1722e0d971996735e0b1ced7aa2dc5abbd1643f4a2b6b4b09ad1dd6dfb74c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are designed to appear as legitimate documents but ultimately redirect to a malicious URL. The ML classifier strongly indicated maliciousness, and the presence of a known malicious redirector URL supports this assessment. The document body, though malformed, contains text related to a work attestation form, likely a lure.

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=formulaire+d+attestation+de+travail+pdf
    • http://files.mhcustomhomes.com/uploads/1/3/1/8/131871871/pemogaminape_vasobo_xegetitobavonow.pdf
    • http://files.mariahelliott.com/uploads/1/3/1/4/131438079/ab92d.pdf
    • http://files.cooldogduke.com/uploads/1/3/1/4/131407705/fotodu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/7342/0965/files/pafobosarewuvojux.pdf
    • https://cdn.shopify.com/s/files/1/0445/8138/8452/files/concepts_of_computer_networking.pdf
    • https://cdn.shopify.com/s/files/1/0434/8205/4813/files/34770475064.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/microsoft_office_product_key_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/8163/7794/files/wotasusefotekuxaxapej.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bivunamu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7922/8833/files/73407034147.pdf
    • https://cdn.shopify.com/s/files/1/0437/0527/0437/files/86932502232.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xokuwunojuvilil.pdf
    • https://cdn.shopify.com/s/files/1/0434/0629/5201/files/kobupotadag.pdf
    • https://cdn.shopify.com/s/files/1/0430/9997/9930/files/95936663901.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/51266648827.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061d1.bin
c7162df43b0b129828fa6f9074b9a230af8c3f8b6e3849e6430cdebcf6ef5dde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61D1 5084 bytes
font_01_sfnt_off00007306.bin
2064ee1d91a22ed614c683462093c65e88f24a75680940228158c5a116134567		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7306 14908 bytes
font_02_sfnt_off0000a03d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA03D 4324 bytes

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