Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cef5485e65b6311…

MALICIOUS

PDF

49.8 KB Created: 2020-08-11 09:40:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 499bebe0fc7e8045a3e10e1d8546d6f8 SHA-1: 76b2e3093c4b742e024e956fe7fe5c0fbddaf5f6 SHA-256: 7cef5485e65b6311633c8fcdb92fb88c10b6d6fccbbe3e63ab545095d6d19c22
120 Risk Score

Malware Insights

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

The PDF contains a mass of external links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the string 'https://ttraff.cc/pify?keyword=calendar+2020+cute+pdf', indicating a lure to a malicious site disguised as a calendar. The presence of numerous PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

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=calendar+2020+cute+pdf
    • http://miruf.csinsf.org/uploads/1/3/0/8/130814921/4f94e3b4f4efe0b.pdf
    • http://files.dogwooddoodlebugs.com/uploads/1/3/1/4/131406843/307724.pdf
    • http://bigex.andrewpevny.com/uploads/1/3/0/7/130776031/katasiru-sebedamosivun.pdf
    • https://cdn.shopify.com/s/files/1/0430/3480/4375/files/26472760164.pdf
    • https://cdn.shopify.com/s/files/1/0430/2805/4169/files/75984473031.pdf
    • https://cdn.shopify.com/s/files/1/0434/6930/8061/files/sekin.pdf
    • https://cdn.shopify.com/s/files/1/0434/4827/1000/files/siwuvok.pdf
    • https://cdn.shopify.com/s/files/1/0429/2080/4518/files/buell_blast_500.pdf
    • https://cdn.shopify.com/s/files/1/0430/3598/4029/files/xibositopozuzuzux.pdf
    • https://cdn.shopify.com/s/files/1/0436/6788/2134/files/rusirasojutavinigakuda.pdf
    • https://cdn.shopify.com/s/files/1/0430/8792/1313/files/45544169787.pdf
    • https://cdn.shopify.com/s/files/1/0434/0803/1893/files/29370941726.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pejuzesuloroxutebed.pdf
    • https://cdn.shopify.com/s/files/1/0438/6871/7216/files/framework_for_marketing_management_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/6712/0539/files/schoolboy_q_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0434/5033/5384/files/pan_card_online_download.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_off000082cd.bin
caaa59ba0f8f43d08cacfa990aa59243e83777d6e412fd37d1c0a6566b5302ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82CD 5152 bytes
font_01_sfnt_off00009460.bin
62b63ba63577b3682b8a8c1811d3912b9b5f5adb0909b5c3e7d595d7345000e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9460 11052 bytes

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