Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec8a9c5deba7704…

MALICIOUS

PDF

39.3 KB Created: 2020-08-24 17:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b4d531ec4ec4e6fb79e86ec2047a1adb SHA-1: 9e77d2f794745333ba7abc9d447aced01b197800 SHA-256: 4ec8a9c5deba77040edc1a9aea5a712e5ae5d35f60e94353f0faca7bea147412
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to a redirector service. The primary malicious link, 'https://ttraff.cc/pify?keyword=black+background+video+effects+free', is designed to lure users with a seemingly relevant search term. The document body, though heavily obfuscated, contains this URL and other PDF links, indicating a phishing or redirection attempt. The ML classifier strongly supports the malicious nature of this PDF.

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=black+background+video+effects+free
    • http://saravufo.maggiehairston.com/uploads/1/3/0/7/130739174/2967632cf.pdf
    • http://tuvodifa.rogueave.com/uploads/1/3/0/7/130739240/6e1631917e.pdf
    • http://files.foleysv.co.uk/uploads/1/3/0/7/130775432/lanuvubeseva_dudalikun_sasunoxewul.pdf
    • https://cdn.shopify.com/s/files/1/0428/0510/0707/files/84720954342.pdf
    • https://cdn.shopify.com/s/files/1/0431/5604/5981/files/76467411982.pdf
    • https://cdn.shopify.com/s/files/1/0449/7945/4111/files/xadixazirubidaxudokop.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8646/files/genetics_and_molecular_biology_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0431/4021/9037/files/worevodab.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/marathi_to_english_barakhadi.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/regugulatu.pdf
    • https://cdn.shopify.com/s/files/1/0440/5785/4102/files/fedex_ltl_bill_of_lading.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/parisibudipaxetiwori.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/lg_refrigerator_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0440/6594/7798/files/delegation_of_financial_power_1978.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_off00005aa0.bin
afdbd63eb7ff42cf8f6a1f60f2bd3cedd265c177190acbe4fd2cc8519146eaf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA0 5500 bytes
font_01_sfnt_off00006d66.bin
3bf5c171e459b24ed176121ba464493978bc56615b4f5e9816562ff2dec0db30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D66 10344 bytes

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