Malicious PDF — malware analysis report

Static analysis result for SHA-256 4921f77d3b758b67…

MALICIOUS

PDF

60.2 KB Created: 2020-08-11 09:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a73dbd6d20af92536361e1a8f1df2902 SHA-1: 64b10f160f3a5636182909c825ff33b9791a1260 SHA-256: 4921f77d3b758b67116e48ca4bc00c628a77116144164732ddb725e9f8cdb075
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. The primary malicious link, 'https://ttraff.cc/pify?keyword=100+carols+for+choirs+pdf+download', is a known malicious redirector. The document body, though heavily obfuscated, contains this malicious URL, suggesting the document's purpose is to redirect users to malicious content.

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=100+carols+for+choirs+pdf+download
    • http://files.theshirehomestead.com/uploads/1/3/0/7/130776460/8237623.pdf
    • http://files.mansfieldvineyard.org/uploads/1/3/0/7/130740231/f9cdfe7.pdf
    • http://files.steveneillsgarage.com/uploads/1/3/0/8/130874123/6e8a6d2184c3eb2.pdf
    • http://files.greenshoe.org/uploads/1/3/0/8/130813616/4178623.pdf
    • http://files.itascasports.com/uploads/1/3/1/4/131437484/mojixe.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/5957595816.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/godavevibiwuvozix.pdf
    • https://cdn.shopify.com/s/files/1/0429/0671/4268/files/geometry_final_exam_review.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/73930450062.pdf
    • https://cdn.shopify.com/s/files/1/0435/3340/2266/files/colloquial_egyptian_arabic.pdf
    • https://cdn.shopify.com/s/files/1/0437/8080/0674/files/biwemabo.pdf
    • https://cdn.shopify.com/s/files/1/0433/7106/9594/files/xegebalowugon.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/aadhar_card_update_form_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/2359/7725/files/automatic_door_opening_system_using_arduino.pdf
    • https://cdn.shopify.com/s/files/1/0430/7678/0192/files/sobazonumafarewaxagul.pdf
    • https://cdn.shopify.com/s/files/1/0434/9971/6770/files/morevipotexizukukivaza.pdf
    • https://cdn.shopify.com/s/files/1/0428/2961/1171/files/gufogovor.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/
    • https://cdn.shopify.com/s/files

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009d54.bin
da3038f8d6b00bb4f075c615454522c37c590faa2ea3fbed1b45f97a0ebc99e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D54 4756 bytes
font_01_sfnt_off0000adac.bin
d51e31d5d48575cf39925f8e1127802ce2a28303332f347b418bad9a1b326fca
pdf-font-stream PDF embedded font (sfnt) at offset 0xADAC 5432 bytes
font_02_sfnt_off0000c024.bin
6572436f95097ecbaabe34936d5c75cf8a8ddd0d7bc9d0cf05e6f0699c8f3e8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC024 10200 bytes