Malicious PDF — malware analysis report

Static analysis result for SHA-256 1606fdf5737a4653…

MALICIOUS

PDF

63.8 KB Created: 2020-07-31 15:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b41459602d628a927df0ee87b4fdab0 SHA-1: ccc9834ad51777014d2e3702179c27f4b5375e9e SHA-256: 1606fdf5737a46532027c0ef462d235cd77c0462a2ee1686d9c62bd16a887e41
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, identified as a link farm, with a critical heuristic firing for linking to known malicious redirector infrastructure. The primary malicious URL identified is ttraff.com, which is used to redirect users. The document body is heavily obfuscated and appears to be junk data, but the presence of numerous links to external PDFs suggests a campaign to manipulate search engine results or distribute further malicious content.

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.com/pify?keyword=cantico+delle+creature+spartito+pdf
    • http://files.salvagejunky.com/uploads/1/3/0/7/130775784/396451.pdf
    • http://files.handmaidsoftheheartofjesus.com/uploads/1/3/0/7/130739180/kovinawuvul-nobulemodixar-mojimilosaparof-mezuxeva.pdf
    • http://files.sportchatteris.com/uploads/1/3/0/9/130969364/6822981.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90067119925.pdf
    • https://cdn.shopify.com/s/files/1/0431/6843/2288/files/darezoxizexarofisapo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8553/6159/files/xerovuratumapikimukopi.pdf
    • https://cdn.shopify.com/s/files/1/0432/9740/7126/files/99710580469.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rumifagekesodurelakalon.pdf
    • https://cdn.shopify.com/s/files/1/0439/3464/6440/files/2645350394.pdf
    • https://cdn.shopify.com/s/files/1/0434/0029/8648/files/jabukipiraliroxaxuvevor.pdf
    • https://cdn.shopify.com/s/files/1/0433/6844/8152/files/27383888155.pdf
    • https://cdn.shopify.com/s/files/1/0435/8239/0431/files/webakepuxisimusukufibemov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58014629257.pdf
    • https://cdn.shopify.com/s/files/1/0431/8996/0865/files/dijisunoxofugovunulavep.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_off0000bca2.bin
bf34230b23c1baf83dee3e90cebcf05d6a1c4d1969cf5c850c3e8cc53ab2c45b
pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA2 5052 bytes
font_01_sfnt_off0000cdd9.bin
18b26d385ba79d066ca41eb89e707f9edb9319d8b0f06881e4ffbb3498944c40
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD9 11116 bytes