Malicious PDF — malware analysis report

Static analysis result for SHA-256 92c875ef7247c684…

MALICIOUS

PDF

37.3 KB Created: 2020-08-11 01:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a48ba43fbfda2ef23b212bbf755c4a85 SHA-1: caacb1c2a625c8e8d8d145284c26157f1fd23162 SHA-256: 92c875ef7247c68448a6fcf4ef4a656e9fd1a5fc19aebf1dfdf143f57ae35fb5
150 Risk Score

Malware Insights

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

The PDF contains a mass of external links, including a critical link to a known malicious redirector at ttraff.cc. The document body, though heavily obfuscated, contains the same URL, suggesting the primary purpose is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=english+grammar+in+use+supplementary+exercises+third+edition+pdf
    • http://files.create2day.org/uploads/1/3/0/7/130775263/polisofewelaw.pdf
    • http://tilef.karlzinsmeister.com/uploads/1/3/1/3/131383651/44436b871.pdf
    • http://bexazomas.farrarmusic.com/uploads/1/3/0/7/130776542/56e17.pdf
    • http://files.yourfurry-godmother.com/uploads/1/3/1/4/131482864/pulupuxuko_jawananesazebon_zopewofazuwo.pdf
    • http://files.ohiocensus.org/uploads/1/3/1/6/131636665/moxasanidegixolopo.pdf
    • https://cdn.shopify.com/s/files/1/0437/0874/3835/files/how_to_make_google_search_for_files.pdf
    • https://cdn.shopify.com/s/files/1/0431/0528/8352/files/zemekezipejazilebalu.pdf
    • https://cdn.shopify.com/s/files/1/0434/5652/8544/files/48185882286.pdf
    • https://cdn.shopify.com/s/files/1/0441/0513/8328/files/38538215186.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99289858455.pdf
    • https://cdn.shopify.com/s/files/1/0439/2599/5688/files/16505746743.pdf
    • https://cdn.shopify.com/s/files/1/0436/0696/6429/files/winows_media_player_9.pdf
    • https://cdn.shopify.com/s/files/1/0432/0791/7729/files/42340041946.pdf
    • https://cdn.shopify.com/s/files/1/0437/1087/3750/files/apparel_merchandising_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/8448/8607/files/university_transcript_sample.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/friedberg_insel_spence_linear_algebra.pdf
    • https://cdn.shopify.com/s/files/1/0432/9704/6696/files/68000137424.pdf
    • https://cdn.shopify.com/s/files/1/0431/6522/1028/files/nenumaporudigupilaxiteva.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48880371243.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_off00005084.bin
8385a647feaedc1834eea2a821d661406a3b5b8e8f767c956ec0b929f6dfd89e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5084 5696 bytes
font_01_sfnt_off000063c1.bin
cef2d2e768661e3ac762e6e403ee13d3f07008e598b33b4275b8b2697b382c54
pdf-font-stream PDF embedded font (sfnt) at offset 0x63C1 10812 bytes