Malicious PDF — malware analysis report

Static analysis result for SHA-256 b48f3006fdcc0da2…

MALICIOUS

PDF

41.1 KB Created: 2020-08-22 20:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b172772cdf73b76c91a9db6680a6d9e7 SHA-1: e286b99cf179345e4cca1b9406ab74f1b2609b17 SHA-256: b48f3006fdcc0da2dce16c32daa4cdffc43d07299c17585564f28b34330b2f57
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised as a Yahoo mail pro APK download. The PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms that the initial URL leads to known malicious infrastructure. The PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many of which are hosted on Shopify, suggesting an attempt to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

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=yahoo+mail+pro+apk
    • http://kevitap.susansimons.com/uploads/1/3/0/9/130969077/ganejizivewesi.pdf
    • http://vaxajun.trulymedium.com/uploads/1/3/2/3/132302921/7325384.pdf
    • http://files.wellness.org.sg/uploads/1/3/1/4/131437249/7598015.pdf
    • http://xefuximu.icaihokokngo.com/uploads/1/3/2/7/132712615/454b52bcc4b4.pdf
    • https://cdn.shopify.com/s/files/1/0436/3023/1712/files/60898822949.pdf
    • https://cdn.shopify.com/s/files/1/0436/9580/0475/files/84091855221.pdf
    • https://cdn.shopify.com/s/files/1/0431/2278/6466/files/acute_tubular_necrosis_pathophysiology.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7755/files/absceso_pulmonar_gpc.pdf
    • https://cdn.shopify.com/s/files/1/0437/1713/2456/files/36868253818.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vatamukizulenekop.pdf
    • https://cdn.shopify.com/s/files/1/0432/3983/3755/files/xovorato.pdf
    • https://cdn.shopify.com/s/files/1/0433/8273/5006/files/70952763058.pdf
    • https://cdn.shopify.com/s/files/1/0457/8705/4246/files/sibidanegug.pdf
    • https://cdn.shopify.com/s/files/1/0428/3367/4396/files/98666125243.pdf
    • https://cdn.shopify.com/s/files/1/0437/0087/9515/files/dnd_5e_all_races.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_off000062de.bin
970d1061417904834d0e7192563cadca14e28b4e0046b2f4574a1757f8149077		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62DE 4904 bytes
font_01_sfnt_off00007365.bin
d6d908fa4117233d15a0e2715bb6bbc28d996b987246a80658d51ab8d563cd4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7365 10572 bytes

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