Malicious PDF — malware analysis report

Static analysis result for SHA-256 7886d93e9bbc70bb…

MALICIOUS

PDF

49.3 KB Created: 2020-08-15 09:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb93025b664cfa51b96b6eea5420eb27 SHA-1: dd1a178e801a837be26a6ab83f3450fa1f5d089b SHA-256: 7886d93e9bbc70bbcd9f6da9b43a3c9a70722e2a6cb01b918ced9c58a1ea16c1
128 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link

The PDF file contains a link farm and a direct link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'cusat question papers' and includes the malicious URL, suggesting a lure for academic-related content. The primary malicious IOC is the redirector URL, which is likely used to serve further malicious content or phishing pages.

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.cc/wb?keyword=cusat%20question%20papers%202016%20with%20solutions%20pdf
    • http://files.t3chlan3.com/uploads/1/3/0/9/130969059/7253293.pdf
    • http://files.traumayellow.com/uploads/1/3/0/7/130776749/7203234.pdf
    • https://cdn.shopify.com/s/files/1/0429/4141/5587/files/gilipurinutedojatobaso.pdf
    • https://cdn.shopify.com/s/files/1/0430/4669/9165/files/numpy_count_nonzero.pdf
    • https://cdn.shopify.com/s/files/1/0434/4633/7693/files/ffxv_chocobo_race.pdf
    • https://cdn.shopify.com/s/files/1/0440/9648/7576/files/hubble_telescope_images_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/dudilapixalejavil.pdf
    • https://cdn.shopify.com/s/files/1/0434/5797/0329/files/boris_vian_livres.pdf
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/rikakikanomogijatino.pdf
    • https://cdn.shopify.com/s/files/1/0429/5137/7049/files/12659726121.pdf
    • https://cdn.shopify.com/s/files/1/0431/9051/7917/files/53324536965.pdf
    • https://cdn.shopify.com/s/files/1/0437/0818/6792/files/toefl_speaking_topics_with_answers.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_off00006b4a.bin
d58377f774f7918a60ff64bf5c444ced78261d44045155479ae91a6fdc315eb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B4A 5732 bytes
font_01_sfnt_off00007ede.bin
b7e77795e83f6ddd146d809b0a9cf356ae033b712a8af118dba89d2ac79fd2a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EDE 13092 bytes
font_02_sfnt_off0000a81e.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA81E 4324 bytes

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