Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a99d3742e78db1a…

MALICIOUS

PDF

43.7 KB Created: 2020-08-06 01:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf7a55e822ca0780e4fe1d4f86fe7a84 SHA-1: 29d2b12bbabea4fe953e60478187ae6db45412f1 SHA-256: 4a99d3742e78db1af47ade699f650701c0512afec98a2eda947c293ca2b12c1a
150 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. Additionally, it features a large number of embedded links, many pointing to Shopify domains, suggesting a link farm designed to obscure the ultimate destination or for SEO manipulation. No scripts were extracted from this sample, and the document body is heavily obfuscated.

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.ru/pify?keyword=cacerola+de+mar+pdf
    • http://files.simplymello.com/uploads/1/3/1/6/131637679/vopeja-jobadena-wixasib-zulugizeranaj.pdf
    • http://files.sparkfoundation.ca/uploads/1/3/2/8/132814371/970ad44f5df489.pdf
    • http://files.paultophamphotography.org/uploads/1/3/1/3/131380493/6910943.pdf
    • https://cdn.shopify.com/s/files/1/0428/8253/1481/files/siguvafufodurokavidovifo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1470/9670/files/situmarom.pdf
    • https://cdn.shopify.com/s/files/1/0434/5420/2013/files/cookie_clicker_infinite_cookies.pdf
    • https://cdn.shopify.com/s/files/1/0431/0892/5600/files/32921522974.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/54058680795.pdf
    • https://cdn.shopify.com/s/files/1/0428/7512/5923/files/buxalulizevudok.pdf
    • https://cdn.shopify.com/s/files/1/0428/5048/4390/files/97176127641.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/bizeruluwezakizulis.pdf
    • https://cdn.shopify.com/s/files/1/0432/6011/7160/files/91623837170.pdf
    • https://cdn.shopify.com/s/files/1/0437/2565/2117/files/rifobijaxun.pdf
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/voduzotanawarad.pdf
    • https://cdn.shopify.com/s/files/1/0431/6318/9412/files/sojorote.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_off00006b14.bin
0a366960a779bc176ea27b9b7d69491d52ee8630b22a48f8e16d4021a23509de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B14 5028 bytes
font_01_sfnt_off00007c13.bin
804fb96a0899185fa050c0509a8768a344f12bb4fd17e3f8d1564ebe01040114		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C13 11196 bytes

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