Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82cdf10760ec290…

MALICIOUS

PDF

41.2 KB Created: 2020-08-08 01:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51c869ce22e16c069e0f5e57ff454b32 SHA-1: f5a826d031a3bb5c6f126d63a7d5ecde66ea3ba6 SHA-256: b82cdf10760ec290e9dd2c7d014fbc2b90830e7f6dd87b95e1e3aa3de53f88ee
120 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic firing indicates that the PDF links to known malicious redirector infrastructure, specifically `https://ttraff.cc/pify?keyword=12th+maths+formulas+list+pdf+hsc`. Another critical heuristic identifies this as a PDF link farm, with 26 external PDF links. The document body text, though heavily obfuscated, contains the string "12th maths formulas list pdf hsc", suggesting a lure to attract users searching for educational materials.

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=12th+maths+formulas+list+pdf+hsc
    • http://files.truebluefishing.co.uk/uploads/1/3/2/7/132741089/9895999.pdf
    • http://files.suaxc.com/uploads/1/3/0/9/130969179/giwovuguj.pdf
    • http://files.melissamakesmoves.com/uploads/1/3/2/6/132682882/77f42994ba7ac99.pdf
    • https://cdn.shopify.com/s/files/1/0448/6791/1842/files/fusionner_plusieurs_online.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4214/files/33083566812.pdf
    • https://cdn.shopify.com/s/files/1/0431/6862/8892/files/70684963002.pdf
    • https://cdn.shopify.com/s/files/1/0436/2538/2051/files/oral_pathology_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tifomev.pdf
    • https://cdn.shopify.com/s/files/1/0428/2921/7958/files/85686665519.pdf
    • https://cdn.shopify.com/s/files/1/0429/6887/5157/files/dutaminipexakedoremirajav.pdf
    • https://cdn.shopify.com/s/files/1/0429/7929/5385/files/priviledged_tv_series.pdf
    • https://cdn.shopify.com/s/files/1/0429/4829/6857/files/vewiwidibeza.pdf
    • https://cdn.shopify.com/s/files/1/0436/7086/4025/files/goduxusi.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_off0000607a.bin
6816639c665b575b35c107028f373ce9f4be23d0e43aa28ff6918094485c1458		 pdf-font-stream PDF embedded font (sfnt) at offset 0x607A 5484 bytes
font_01_sfnt_off000072f7.bin
6304fef505aef863243f29a63f992da33f0b6c9cf04974538c76a40ad8b81c65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F7 10940 bytes

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