Malicious PDF — malware analysis report

Static analysis result for SHA-256 609295e5faad6829…

MALICIOUS

PDF

43.1 KB Created: 2020-08-05 04:41:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5f7d461acf7efcf4de97d13bd0df6360 SHA-1: 774e657760c319d928b68e0f3d12a5e1d1914bf1 SHA-256: 609295e5faad6829d186049b87a1c72414e3ea7f514f4d4af4deac93a60ccfff
162 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure for an 'answer key', and the heuristic firings confirm the presence of malicious redirector links and a link farm. The primary malicious URL identified is https://ttraff.ru/pify?keyword=tallentex+answer+key+2020+pdf, which likely leads to a further stage of the attack.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=tallentex+answer+key+2020+pdf
    • http://files.pleasantlyplucky.com/uploads/1/3/1/0/131071157/xuvinowol.pdf
    • http://files.vegantogosxm.com/uploads/1/3/1/4/131454352/sijomebalijones.pdf
    • http://files.ouhsdra.org/uploads/1/3/0/8/130814078/6513122.pdf
    • http://files.greeceneedslove.com/uploads/1/3/1/4/131407051/fewixogajuwi.pdf
    • http://nugekin.sfrachristmastrees.co.uk/uploads/1/3/1/6/131606260/bibemizisasokumadara.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/japoxotoruzub.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2995/files/factorio_blue_circuit_blueprint.pdf
    • https://cdn.shopify.com/s/files/1/0434/6534/3141/files/tutatuninav.pdf
    • https://cdn.shopify.com/s/files/1/0435/1809/9615/files/vutanunazamoriwomokuv.pdf
    • https://cdn.shopify.com/s/files/1/0435/1623/1840/files/autoclave_working_principle.pdf
    • https://cdn.shopify.com/s/files/1/0432/4828/7912/files/mozigaponofuk.pdf
    • https://cdn.shopify.com/s/files/1/0428/6509/8908/files/93834905728.pdf
    • https://cdn.shopify.com/s/files/1/0429/6838/3642/files/fimoxemimefuwipaw.pdf
    • https://cdn.shopify.com/s/files/1/0438/5583/9392/files/510544291.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/81765030704.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_off00006a03.bin
bc779febaf74b328a7577386041814545f694bdb83a3a997798780f8617eef85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A03 5584 bytes
font_01_sfnt_off00007d31.bin
fde1ef43d387f8f4ce02e5929a2b6f3f9babd31300f131b8ce53fe2e11acfd8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D31 10136 bytes

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