Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77b9c9b0f5b113b…

MALICIOUS

PDF

47.4 KB Created: 2020-08-07 03:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27e6d64939d1a03445299256e5832b7f SHA-1: 29812eb6f89304f6d3f353f948d27261ed0e096d SHA-256: b77b9c9b0f5b113bb820630c6fe123d1a658ef92977c63d55596264e201cc2ae
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of numerous other links to Shopify domains, as flagged by the PDF_SEO_LINK_FARM heuristic, indicates a potential link farm used to distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.cc/pify?keyword=gaspillage+de+l+eau+pdf
    • http://files.worxforms.com/uploads/1/3/2/7/132740764/kakerugonames_jukufamepenib_fedabudifib_lomudigesupoda.pdf
    • http://files.clarencecoastdbclub.com.au/uploads/1/3/0/8/130874482/vurivemen.pdf
    • http://mamatu.brambleithaca.com/uploads/1/3/1/4/131438137/6151127.pdf
    • http://wunaziser.onelasalle.com/uploads/1/3/0/7/130775971/kanadaxubivived_tasimukilexiven.pdf
    • http://files.aicepsych.com/uploads/1/3/1/3/131383586/xawewilazorunejuwojo.pdf
    • https://cdn.shopify.com/s/files/1/0438/5302/1334/files/solar_12v_battery_charger_circuit_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0430/1229/2767/files/gapafimezamedaluvil.pdf
    • https://cdn.shopify.com/s/files/1/0437/4075/8170/files/bomadadaf.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8298/files/5630292144.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2465/files/79921333735.pdf
    • https://cdn.shopify.com/s/files/1/0432/0254/3778/files/absceso_dentoalveolar_tratamiento.pdf
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/soul_ties_book.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0352/files/mujixigubokinoza.pdf
    • https://cdn.shopify.com/s/files/1/0432/7853/2761/files/love_death_4_game.pdf
    • https://cdn.shopify.com/s/files/1/0429/0789/3919/files/46611290809.pdf
    • https://cdn.shopify.com/s/files/1/0430/5911/8229/files/rumijotewuvunefet.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077e5.bin
29b089c1e8745ff18bead2cd09b2db59ac358e5554896888dfbf752d64aa2080
pdf-font-stream PDF embedded font (sfnt) at offset 0x77E5 5144 bytes
font_01_sfnt_off00008982.bin
8cd49ae54c6ad9abdb74783fbc701514ee89412520dbe1f3c3596f5d813b2819
pdf-font-stream PDF embedded font (sfnt) at offset 0x8982 11864 bytes