Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5cb634495e27f3…

MALICIOUS

PDF

56.7 KB Created: 2020-08-22 06:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 56c4856a94b0d40dab9acc485dca5cb4 SHA-1: 066a80d2c6f30321a9a7868326ac6bc505c63710 SHA-256: 8c5cb634495e27f330f96f7c325dcaf93d8d16378af83d02635e3c6aedc1510b
128 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, indicating an attempt to lead the user to malicious content. The document body, though heavily obfuscated, contains the URL 'https://ttraff.ru/pify?keyword=cdac+exam+papers' which is flagged as a malicious redirector. The presence of numerous other PDF links, many hosted on shopify.com, suggests a link farm designed to obscure the true malicious destination. The heuristic 'SE_DOWNLOAD_BUTTON' further supports the lure-based attack pattern.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=cdac+exam+papers
    • http://files.exoticfeeders.com/uploads/1/3/1/0/131070918/jexijafokubi.pdf
    • http://fetoruze.worstplayer50.com/uploads/1/3/1/4/131406071/303fa2aff64f.pdf
    • https://cdn.shopify.com/s/files/1/0432/7555/0876/files/50531707286.pdf
    • https://cdn.shopify.com/s/files/1/0433/4845/9673/files/nakorevisise.pdf
    • https://cdn.shopify.com/s/files/1/0431/9664/5536/files/91344832109.pdf
    • https://cdn.shopify.com/s/files/1/0433/0166/6969/files/tarezasowag.pdf
    • https://cdn.shopify.com/s/files/1/0429/8683/2035/files/css_grid_template_responsive.pdf
    • https://cdn.shopify.com/s/files/1/0438/7766/2875/files/descriptive_writing_worksheet_ks2.pdf
    • https://cdn.shopify.com/s/files/1/0436/5962/4606/files/circular_array_queue_java.pdf
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/gesinupizu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0982/6213/files/29570675937.pdf
    • https://cdn.shopify.com/s/files/1/0464/7436/3048/files/iconics_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/1959/2099/files/vector_algebra_maths.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9833/files/dexawonetenukavivuxajuno.pdf
    • https://cdn.shopify.com/s/files/1/0435/8442/2051/files/amnistia_internacional_venezuela_informe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8330/8955/files/learn_kathak_dance_video.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000731a.bin
0a84c256b9060fe8f3667993343c6f9e4dac646a9745a7deaf6184c0922eec28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x731A 4724 bytes
font_01_sfnt_off00008317.bin
026de1076dad6614fee7b4839f066e743e4238b5ddea94259138cfcd618330b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8317 2320 bytes
font_02_sfnt_off00008d69.bin
992f69c5b7f179f4c273a9346989725d9fe782d0ef936907e9f473c332f4c793		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D69 10404 bytes
font_03_sfnt_off0000b0f4.bin
02eb72310c77882d7c7d6d87c01b160a317d8f3702357d62d98d6e22e5499f18		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F4 16284 bytes
font_04_sfnt_off0000c693.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC693 4324 bytes

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