Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77fb7916329d784…

MALICIOUS

PDF

53.5 KB Created: 2020-08-03 01:24:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 016f975b1b9a2e74650f4cb54a8e404b SHA-1: 2dc73ecdef2d1c49a8c192bb9124e38039784d9b SHA-256: a77fb7916329d78457fca3db16dff5ea90ee9452e12af761bae121277e885b73
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting the document's primary purpose is to distribute links. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the link farm and redirector strongly indicate a phishing or malware distribution attempt.

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.cc/pify?keyword=mt+state+abbreviation
    • http://files.authoravadanielle.com/uploads/1/3/1/4/131437385/5071130.pdf
    • http://files.michelemattinglybooks.com/uploads/1/3/2/7/132710601/3002239.pdf
    • http://files.blueskyaero.com/uploads/1/3/2/3/132302894/2324907.pdf
    • http://voduzijin.dmartinezcea.com/uploads/1/3/0/7/130738914/1685676.pdf
    • https://cdn.shopify.com/s/files/1/0433/0238/7867/files/diablo_3_whimsydale.pdf
    • https://cdn.shopify.com/s/files/1/0432/7764/8027/files/ibn_khaldun_muqaddimah.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/51037406861.pdf
    • https://cdn.shopify.com/s/files/1/0429/3391/1705/files/47066286509.pdf
    • https://cdn.shopify.com/s/files/1/0434/1845/2120/files/70012802549.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/kelewawe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5240/8742/files/botufa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6942/3269/files/dewukumupinuwoxetilufuwa.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1520/files/7210149880.pdf
    • https://cdn.shopify.com/s/files/1/0434/2326/9014/files/lumegurisad.pdf
    • https://cdn.shopify.com/s/files/1/0432/1663/4016/files/79974606769.pdf
    • https://cdn.shopify.com/s/files/1/0431/0718/8898/files/tedidubazajufisi.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_off00008a32.bin
d587bbad7a4bf547cb8c0e44059c84dea1d3676828dbf4956eccfaa7462a72b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A32 4852 bytes
font_01_sfnt_off00009acf.bin
5be3cd375c00c9b2a6b9417296be4231546eecd8a9e3563d8d6d6664653cb99a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9ACF 15000 bytes

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