Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ae8d6b671180313…

MALICIOUS

PDF

34.8 KB Created: 2020-09-03 00:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c955473b9afc51a72b743d585dbec379 SHA-1: 8f1ce3128eaa42ee53b39c3ed7a0b89a75222b5c SHA-256: 4ae8d6b671180313e7c989f573aa35d3aff7559a3e2f22996eaaa0e78c9bc189
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links to other PDF files, characteristic of a link farm. One of these links, 'https://ttraff.com/pify?keyword=doing+corpus+linguistics+crawford+pdf', is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be corrupted or heavily encoded, but the presence of the malicious URL and the link farm structure strongly suggest a malicious intent, likely to redirect users to harmful 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=doing+corpus+linguistics+crawford+pdf
    • https://cdn.shopify.com/s/files/1/0429/7300/3939/files/the_gardener_by_sarah_stewart.pdf
    • https://cdn.shopify.com/s/files/1/0429/1844/5223/files/dixaxulukuto.pdf
    • https://cdn.shopify.com/s/files/1/0432/0811/4340/files/vadivajafemipot.pdf
    • https://cdn.shopify.com/s/files/1/0436/5529/9237/files/apuntes_psicologia_de_la_emocion_uned.pdf
    • https://static.usrfiles.com/ugd/f6a907_cb6012770f79492c8b75d3a4543d0d11.pdf
    • https://static.usrfiles.com/ugd/e2f197_ed569aa6573048d3bead3c759d92ff66.pdf
    • https://static.usrfiles.com/ugd/cbdbb6_671374dded9743759f8a169411e20865.pdf
    • https://static.usrfiles.com/ugd/dd6616_33a5328cec3a43aab04bf6bb33d8e524.pdf
    • https://cdn.shopify.com/s/files/1/0432/1027/7025/files/action_replay_dsi_software.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/rutebedexigot.pdf
    • https://cdn.shopify.com/s/files/1/0429/2077/1751/files/rabekevetadora.pdf
    • https://cdn.shopify.com/s/files/1/0441/1876/9816/files/wunajinamutuzaxaxigikoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/6598/3655/files/46876196343.pdf
    • https://cdn.shopify.com/s/files/1/0429/8014/7359/files/32645232961.pdf
    • https://cdn.shopify.com/s/files/1/0430/6118/2617/files/62035205029.pdf
    • https://cdn.shopify.com/s/files/1/0459/2585/9495/files/most_useful_apps_2018_android.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_off00004a23.bin
ce510841991215d4952cfcdc3cd460ab6a6eecd359c633af14cbd0e14e4a46f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A23 5416 bytes
font_01_sfnt_off00005cbc.bin
7f8d8d7d4b4c335f3b0b3b9388e1b7081484f3d6906e632a6dce6d6331e75520		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CBC 9800 bytes

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