Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc765a9065707327…

MALICIOUS

PDF

38.5 KB Created: 2020-08-10 20:39:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8f19f27748e9bed8c1988951acff6019 SHA-1: 770709a3c6ffda527dc741af8ffb56ebd965ebea SHA-256: dc765a90657073272452a7be02de232e1fdc814a96d27a7df31fd9e6ca5edd89
120 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a link farm, embedding numerous URLs, with a primary malicious redirector identified at 'https://ttraff.ru/pify?keyword=acca+f3+course+notes+pdf'. The document body, though partially corrupted, contains text suggesting it is disguised as 'Acca f3 course notes pdf', likely a lure to encourage users to click the embedded links. The presence of a malicious redirector and a large number of external links strongly indicates a phishing or spam distribution attempt.

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=acca+f3+course+notes+pdf
    • http://files.greypartners.com/uploads/1/3/1/4/131407705/tibigasoduzepap.pdf
    • http://files.ivyensemble.com/uploads/1/3/0/7/130740048/1107996.pdf
    • http://pijaxexu.harvestnewport.com/uploads/1/3/0/7/130776757/kadubukalobutajup.pdf
    • http://mapidu.funeralministry.com/uploads/1/3/1/4/131453046/fovijagevabezubafoj.pdf
    • http://files.lucysugerman.com/uploads/1/3/1/8/131858975/kanowixe_nimalo_gajugun.pdf
    • https://cdn.shopify.com/s/files/1/0433/1359/4526/files/english_to_urdu_dictionary_free_download_full_version.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32732230761.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/36794989837.pdf
    • https://cdn.shopify.com/s/files/1/0433/8846/9411/files/36071301590.pdf
    • https://cdn.shopify.com/s/files/1/0433/0058/5636/files/kenyan_budget_2020.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/25668779603.pdf
    • https://cdn.shopify.com/s/files/1/0437/5845/2897/files/lyman_reloading_manual_50th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0438/1537/0912/files/42971419683.pdf
    • https://cdn.shopify.com/s/files/1/0437/4419/8805/files/wofivemevazo.pdf
    • https://cdn.shopify.com/s/files/1/0428/4357/0343/files/lalubukulo.pdf
    • https://cdn.shopify.com/s/files/1/0436/0755/6258/files/36415629400.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_off00005951.bin
6dfe5cf0e8efae49bdb077bdc000be9339bf5618f07049004a7f119ab3e0b573		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5951 5272 bytes
font_01_sfnt_off00006b48.bin
8e01fe97ab7e0ea9a015cf91be8b9d94d7f1ced005fc4d35f339c8deceda7138		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B48 9896 bytes

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