Malicious PDF — malware analysis report

Static analysis result for SHA-256 6334d2a13e1e5f89…

MALICIOUS

PDF

74.4 KB Created: 2020-08-11 19:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2a19f5d8c11fb939f3f6c8b63912e8d0 SHA-1: 731909bc97209ff60dd588f53dcb2b4d8a06350d SHA-256: 6334d2a13e1e5f89388fc36ac7548a6be15cbacc63a961d777b82e4fe2e89750
154 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which, 'https://ttraff.ru/pify?keyword=an+introduction+to+behavioral+economics+pdf+download', is flagged as a malicious redirector. The document body also contains this URL, suggesting a lure to download a PDF. The presence of numerous other links to Shopify domains, while benign, indicates a link farm strategy. The ML classifier strongly indicates maliciousness.

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=an+introduction+to+behavioral+economics+pdf+download
    • http://files.dvowfoxvalley.org/uploads/1/3/2/7/132740845/zazaxuwozapawot.pdf
    • http://nogedalu.thegoldenreikicenter.com/uploads/1/3/1/4/131482975/935a523eee.pdf
    • http://files.claridgechang.net/uploads/1/3/0/7/130740438/fewer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/2371/9845/files/34703382137.pdf
    • https://cdn.shopify.com/s/files/1/0449/4416/2975/files/fatalism_philosophy.pdf
    • https://cdn.shopify.com/s/files/1/0433/2853/6731/files/bridge_over_troubled_water_piano_music.pdf
    • https://cdn.shopify.com/s/files/1/0448/1295/9905/files/organelos_de_la_celula_animal_y_sus_funciones.pdf
    • https://cdn.shopify.com/s/files/1/0435/5073/6533/files/chemical_reactions_and_chemical_reactors_roberts.pdf
    • https://cdn.shopify.com/s/files/1/0428/4442/2310/files/burivekakez.pdf
    • https://cdn.shopify.com/s/files/1/0429/8738/9087/files/xufitobixelizosuguvetug.pdf
    • https://cdn.shopify.com/s/files/1/0428/4035/9068/files/tipimapafeguj.pdf
    • https://cdn.shopify.com/s/files/1/0429/1638/0831/files/zegixezejabozubogixo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8425/9231/files/83268986061.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_off0000e4da.bin
12466994f3663a97c4f07573090441c92a6877de92004a427c3d83de6ae093fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DA 5676 bytes
font_01_sfnt_off0000f806.bin
39bf860cf2e9aca81663a3190909717e4c06ef844e2cd96454ab69b55fa2c8f8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF806 10604 bytes