Malicious PDF — malware analysis report

Static analysis result for SHA-256 c971ccfa8359bb4e…

MALICIOUS

PDF

45.1 KB Created: 2020-08-01 14:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06822066f6bafec27806826486cc288a SHA-1: 4dc2e44efc7613387194aa90ac78953b2251607a SHA-256: c971ccfa8359bb4e7de71d16cf59fb2aae91d04e1a5bcd1dc1f0778320cd04a5
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=huffmantree+java+github'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many pointing to Shopify domains. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL and keywords that might be used for SEO poisoning to attract unsuspecting users.

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.com/pify?keyword=huffmantree+java+github
    • http://files.paisanoperformance.com/uploads/1/3/0/7/130776206/falum_wopirezenetoled_wuzewidalasiruj_vadizutogule.pdf
    • http://files.barrybuilds.com/uploads/1/3/2/7/132740547/83426f9ac.pdf
    • http://files.backstageknitting.com/uploads/1/3/1/3/131398095/7790049.pdf
    • http://files.lightsondickens.com/uploads/1/3/1/3/131398219/73d3a9ece7.pdf
    • https://cdn.shopify.com/s/files/1/0430/0383/8615/files/kwikset_smartcode_909_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/4958/2743/files/23691537371.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/23489867889.pdf
    • https://cdn.shopify.com/s/files/1/0429/0379/7913/files/82439625393.pdf
    • https://cdn.shopify.com/s/files/1/0430/8847/8365/files/93199863232.pdf
    • https://cdn.shopify.com/s/files/1/0432/1574/9281/files/44997809711.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zexula.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/54440827626.pdf
    • https://cdn.shopify.com/s/files/1/0435/3287/7976/files/78787814754.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/43504582291.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7992/files/5036195050.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6340/files/tarale.pdf
    • https://cdn.shopify.com/s/files/1/0437/3954/5761/files/9270320049.pdf
    • https://cdn.shopify.com/s/files/1/0438/5452/8677/files/jokofelabevedixux.pdf
    • https://cdn.shopify.com/s/files/1/0438/7880/9755/files/jimas.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_off0000632e.bin
fee45d78b287b244238b11419147ea2bae4a96c0745050646abb32a5bf6607aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x632E 4980 bytes
font_01_sfnt_off000073f6.bin
3ce9a009eff8b49c4289ad9483c1cc8f7330f9881d7f4aa912f7ba289bca087b
pdf-font-stream PDF embedded font (sfnt) at offset 0x73F6 10920 bytes
font_02_sfnt_off00009909.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9909 4324 bytes