Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2231cb5bb2364b5…

MALICIOUS

PDF

43.9 KB Created: 2020-08-20 14:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 038b9261817a26b44cccc48abefdcb94 SHA-1: 2638a7c79f94d6aec9e295a28205370a6348c287 SHA-256: d2231cb5bb2364b51ba4d3c42bd72bf75dbe866d9f4ccb293793abb80175606d
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 specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text appears to be garbled, but the presence of the malicious redirector URL suggests an attempt to lure the user to a malicious site, likely for phishing or malware distribution.

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=bohat%25C3%25BD+t%25C3%25A1ta+chud%25C3%25BD+t%25C3%25A1ta+kniha+pdf
    • http://files.octaviusmagazine.com/uploads/1/3/1/6/131606789/801afcc917f9b.pdf
    • https://cdn.shopify.com/s/files/1/0431/7511/6964/files/51070464333.pdf
    • https://cdn.shopify.com/s/files/1/0429/5481/7690/files/valonupedeke.pdf
    • https://cdn.shopify.com/s/files/1/0434/2713/5640/files/wugenazarikupeni.pdf
    • https://cdn.shopify.com/s/files/1/0432/1391/4276/files/maari_song_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/5837/3542/files/42160575650.pdf
    • https://cdn.shopify.com/s/files/1/0427/5086/9671/files/baby_shark_piano_sheet_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zavoriduxosijalas.pdf
    • https://cdn.shopify.com/s/files/1/0447/9670/6967/files/lusobuga.pdf
    • https://cdn.shopify.com/s/files/1/0433/9639/9265/files/2208600176.pdf
    • https://cdn.shopify.com/s/files/1/0432/6214/8763/files/22255884633.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_off00005bcc.bin
0033e1b52c24a64250cd8251423338140d59f3c186b13f1836566ffff07210e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BCC 5172 bytes
font_01_sfnt_off00006cce.bin
0a94075e70627de93d02d0162f9ff83af25edd34abc439d4fe4b526ffc8de76a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CCE 12444 bytes
font_02_sfnt_off00009313.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9313 4324 bytes

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