Malicious PDF — malware analysis report

Static analysis result for SHA-256 edc9ce4a3719e623…

MALICIOUS

PDF

57.4 KB Created: 2020-08-09 14:37:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f081eee8e6e530ec48f2734429338bf SHA-1: 7ed8b862a0b8a0fdb5ad160644f136b8842dd649 SHA-256: edc9ce4a3719e6237479f4099968cab895fe2826f1c7ff82ff797cf8fb940c71
152 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, specifically pointing to 'ttraff.cc'. The document body also contains this URL, along with numerous other PDF links hosted on Shopify and other domains, indicating a link farm designed to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to a malicious redirector, likely for further exploitation or credential harvesting.

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=curso+de+economia+moderna+paul+samuelson+pdf
    • http://jogetufor.atouch-ofhealing.com/uploads/1/3/1/4/131406202/1522889.pdf
    • http://files.japanesehomecookingclassyurico.com/uploads/1/3/0/9/130969434/lovata_sejatedujoduwaw_risobadugeme.pdf
    • http://files.shinyredcopy.com/uploads/1/3/2/6/132681969/lofid_motujobakiv_vizumiz.pdf
    • http://files.westfieldboyssoccer.com/uploads/1/3/2/6/132695749/fufurux.pdf
    • http://files.lucillescatering.com/uploads/1/3/2/6/132695629/2fcae8a787eda95.pdf
    • https://cdn.shopify.com/s/files/1/0436/0785/1171/files/91103548056.pdf
    • https://cdn.shopify.com/s/files/1/0432/4317/6091/files/bank_of_baroda_internet_banking_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/7254/4150/files/mastering_metrics_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/1814/9285/files/20035434074.pdf
    • https://cdn.shopify.com/s/files/1/0433/7418/2563/files/sdgs_summary.pdf
    • https://cdn.shopify.com/s/files/1/0431/3730/2685/files/zuwal.pdf
    • https://cdn.shopify.com/s/files/1/0430/6147/7527/files/adobe_writer_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bifezunelavezide.pdf
    • https://cdn.shopify.com/s/files/1/0430/1350/5185/files/sentinel_roblox_exploit.pdf
    • https://cdn.shopify.com/s/files/1/0436/1384/7714/files/43975718373.pdf
    • https://cdn.shopify.com/s/files/1/0434/4184/8470/files/94357383350.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/72835490563.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_off000083d6.bin
4ad044d74c6a9cd12f39ca0d333256be2cbed777d5cb766243b9e0b069028258		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83D6 5124 bytes
font_01_sfnt_off00009523.bin
08535e66e54a7e950469a9c6d3d95b8c7127f120dffb2437dd9e494d1e9355be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9523 17104 bytes
font_02_sfnt_off0000c7e9.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E9 4324 bytes

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