Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c275fda5aa6baa…

MALICIOUS

PDF

53.6 KB Created: 2020-08-20 10:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc3a67557b4cd11622454c215fc9f12b SHA-1: 286191bb0553e1827908980ca85f9e1c05450571 SHA-256: f5c275fda5aa6baa98b660b73632779697a5541d1780a7e4b1b494b732bf443f
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with a critical heuristic firing indicating a link farm pointing to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves leveraging these links to direct users to potentially harmful content, obscuring the true destination through the redirector.

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=anxi%25C3%25A9t%25C3%25A9+de+performance+adulte
    • http://nemax.polevaultacademy.com/uploads/1/3/2/6/132680874/9881074.pdf
    • http://files.brewhouseboutique.com/uploads/1/3/1/0/131070336/5490711.pdf
    • http://files.backcountryexplorers.com/uploads/1/3/0/7/130775436/caa67.pdf
    • http://files.kcmetalsmithing.com/uploads/1/3/2/6/132681352/mobig.pdf
    • http://files.cabravets.com/uploads/1/3/0/7/130776500/fepevojasiremoreg.pdf
    • https://cdn.shopify.com/s/files/1/0437/7011/8302/files/85502730209.pdf
    • https://cdn.shopify.com/s/files/1/0436/9842/1913/files/11587296311.pdf
    • https://cdn.shopify.com/s/files/1/0433/6369/6799/files/android_navigation_architecture_component_example_github.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/sitasifelawijamuko.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/zuwofofobon.pdf
    • https://cdn.shopify.com/s/files/1/0438/7789/2251/files/denejezizawefepasirivi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuxovozukirofavekejob.pdf
    • https://cdn.shopify.com/s/files/1/0429/2558/8639/files/assembler_photoshop.pdf
    • https://cdn.shopify.com/s/files/1/0434/6196/8025/files/rozevudumojugodedupowi.pdf
    • https://cdn.shopify.com/s/files/1/0433/1202/1657/files/45431935106.pdf
    • https://cdn.shopify.com/s/files/1/0440/5837/8392/files/ximuxonajojivekumero.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007c17.bin
1365b98f85356b7bc9700fb7c84c5cba94a5e52b5a73849a771a58a8b05453a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C17 5204 bytes
font_01_sfnt_off00008d65.bin
95087336bdf9e3d780f07a86e729d537460acff735cd75f5d569595d94771af0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D65 14572 bytes
font_02_sfnt_off0000b903.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB903 4324 bytes

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