Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03cf55daebca82c…

MALICIOUS

PDF

69.6 KB Created: 2020-08-18 19:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98d9dfa2177e52b756127da88eb50eaf SHA-1: 505302fa44117679ec79a1f89cd61409744960a5 SHA-256: f03cf55daebca82c9785a2e33150fb8246197417fd5d0f29a74a7e6218202e57
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.ru/pify?keyword=geometry+circles+and+arcs+worksheet+answers'. Another critical heuristic indicates a PDF link farm, with 'https://cdn.shopify.com/s/files/1/0437/9800/3874/files/2105569393.pdf' being the first URL in this farm. The document body, though heavily obfuscated, contains text related to geometry worksheets and the malicious URL, suggesting a lure to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=geometry+circles+and+arcs+worksheet+answers
    • http://files.fwdskillzone.com/uploads/1/3/1/8/131857315/vanelugof.pdf
    • https://cdn.shopify.com/s/files/1/0437/9800/3874/files/2105569393.pdf
    • https://cdn.shopify.com/s/files/1/0437/4672/1946/files/boloruduwese.pdf
    • https://cdn.shopify.com/s/files/1/0435/0954/7174/files/introduction_to_reliability_analysis_zacks.pdf
    • https://cdn.shopify.com/s/files/1/0428/9832/5671/files/calligraphy_writing_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0434/0262/5178/files/16550215090.pdf
    • https://cdn.shopify.com/s/files/1/0447/8589/3542/files/calling_sehmat_full_novel_download.pdf
    • https://cdn.shopify.com/s/files/1/0448/0958/4802/files/businessman_2_film_song.pdf
    • https://cdn.shopify.com/s/files/1/0428/4838/7239/files/dekotebela.pdf
    • https://cdn.shopify.com/s/files/1/0433/4118/5189/files/ketinikutinelotanafaja.pdf
    • https://cdn.shopify.com/s/files/1/0434/8451/2418/files/github_ssh_permission_denied_publickey.pdf
    • https://cdn.shopify.com/s/files/1/0436/1030/8765/files/anganwadi_helper_form.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_off0000c77a.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC77A 2828 bytes
font_01_sfnt_off0000d174.bin
563fcdd56ccfb873f1f4d684afdd3ad7f834317cdab4506018a34d89ff183087		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD174 5468 bytes
font_02_sfnt_off0000e3f4.bin
9d1e70c6edfea73815ecb45d0711dc317a2c9a37f050c0afc08fc132d095c546		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 10164 bytes

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