Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1ca03fbfbf62e3…

MALICIOUS

PDF

55.9 KB Created: 2020-08-01 03:33:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0d1c7e14258f05f7e5ab049a7c48bac SHA-1: 7be979f525bba12249fddf8d5a11c29b722a68ff SHA-256: fc1ca03fbfbf62e36498fab82a4c678dcee3b0dda20e8bff4cb8ac18d5721b14
150 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files hosted on Shopify and other domains, forming a link farm. One prominent URL, https://ttraff.cc/pify?keyword=subnet+mask+cheat+sheet, is identified as a malicious redirector. The document body, though partially corrupted, contains text related to "Subnet mask cheat sheet" and the authoring application, suggesting a lure to disguise the malicious redirection. The ML classifier 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=subnet+mask+cheat+sheet
    • http://files.oldboneymountain.org/uploads/1/3/1/4/131437778/4475634.pdf
    • http://files.heathandhaveringurc.co.uk/uploads/1/3/1/6/131637271/mulebojalogox-zewupuj-popemema-libigav.pdf
    • http://files.bodegabayhouse.com/uploads/1/3/2/7/132741334/kezaxolivegekem.pdf
    • http://files.swinglecountertops.com/uploads/1/3/1/0/131070572/xoxivegiweroxovodud.pdf
    • http://files.rmhsperformingarts.com/uploads/1/3/1/4/131453650/somudizevikigupijas.pdf
    • https://cdn.shopify.com/s/files/1/0434/9270/4408/files/tavawazidojaxesazibolole.pdf
    • https://cdn.shopify.com/s/files/1/0430/0875/3827/files/42471614292.pdf
    • https://cdn.shopify.com/s/files/1/0433/7962/2040/files/2524616310.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/97454987384.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/10217245918.pdf
    • https://cdn.shopify.com/s/files/1/0431/7272/4900/files/86904466554.pdf
    • https://cdn.shopify.com/s/files/1/0428/8577/5519/files/vavonepe.pdf
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/lowabetoxoxoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/xosadunivixewugu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6289/4485/files/pumurakuk.pdf
    • https://cdn.shopify.com/s/files/1/0436/7430/4662/files/66946670111.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wotedosepano.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_off000086e2.bin
aa501fb4dfcde510b040b24cc05c36d0aec8b69ec93d45f42bbb6df1d1109634
pdf-font-stream PDF embedded font (sfnt) at offset 0x86E2 4944 bytes
font_01_sfnt_off00009776.bin
f4e09e8629ebdc863a3d7a1645140cf710205874093fb91767b236b3bc132c5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x9776 13640 bytes
font_02_sfnt_off0000c250.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC250 4324 bytes