Malicious PDF — malware analysis report

Static analysis result for SHA-256 93be937e69d03458…

MALICIOUS

PDF

55.3 KB Created: 2020-08-22 11:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a862a59eb7edb8c055db6db1434dae7f SHA-1: e6f960db86eeac903684b49133f89e8e22d1d03a SHA-256: 93be937e69d03458c35f872c9d1fc1c79cb39cb335d9dbde98ec6d9737eff44c
150 Risk Score

Malware Insights

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

The PDF file contains a lure related to 'metric unit conversion table worksheet answers' and embeds numerous links, many of which point to Shopify-hosted PDFs. One critical heuristic firing indicates a direct link to a known malicious redirector at 'ttraff.ru'. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to malicious infrastructure through a deceptive document.

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.ru/pify?keyword=metric+unit+conversion+table+worksheet+answers
    • http://files.orthodoxservantleaders.com/uploads/1/3/0/8/130873975/dojatizep.pdf
    • http://files.ronandthaophotography.com/uploads/1/3/1/3/131381607/pipixubujata-kapepupixevoded-juxizavafuj.pdf
    • https://cdn.shopify.com/s/files/1/0446/0979/8307/files/69982963731.pdf
    • https://cdn.shopify.com/s/files/1/0429/7352/8213/files/5732592653.pdf
    • https://cdn.shopify.com/s/files/1/0440/7354/9974/files/lokenunugibavu.pdf
    • https://cdn.shopify.com/s/files/1/0427/4854/3142/files/jirilo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1086/7871/files/dojuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/9573/5976/files/aranyak_bibhutibhushan.pdf
    • https://cdn.shopify.com/s/files/1/0427/7387/2807/files/www_masrawy_coom.pdf
    • https://cdn.shopify.com/s/files/1/0443/0092/7132/files/cash_flow_statement_file.pdf
    • https://cdn.shopify.com/s/files/1/0434/3418/0769/files/97849003967.pdf
    • https://cdn.shopify.com/s/files/1/0428/0595/2671/files/7079890992.pdf
    • https://cdn.shopify.com/s/files/1/0460/1400/5407/files/black_opera_mini_apk.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6845/files/copy_sqlite_database_from_android_to_pc.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000081f2.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f
pdf-font-stream PDF embedded font (sfnt) at offset 0x81F2 2828 bytes
font_01_sfnt_off00008bec.bin
da7f3b18636b80cee0dd311538fe01c0eb0873a63ecc34f94f88b76c38140679
pdf-font-stream PDF embedded font (sfnt) at offset 0x8BEC 5128 bytes
font_02_sfnt_off00009d6e.bin
29e46a8c80b83f8af7db25f67c9d8abf0b70e6b382039eac3c9e69248939818d
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D6E 9876 bytes
font_03_sfnt_off0000bf3b.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3B 4324 bytes