Malicious PDF — malware analysis report

Static analysis result for SHA-256 a989fd2bd61b4fcf…

MALICIOUS

PDF

37.2 KB Created: 2020-09-07 10:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4c67800ed587fcd5b499a567d6888ed4 SHA-1: 1726aa4f0eccbd3b8615e17262a7a5bdc59da567 SHA-256: a989fd2bd61b4fcf650120f8de7dbd885ca11138b748c92a7f4b08820d876d84
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, one of which points to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting it is a handbook, likely a lure to encourage clicks. The presence of multiple external PDF links further supports a link-farming or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.club/pify?keyword=the+cardiac+catheterization+handbook+5th+edition+pdf In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_82c0bf740d0c4bbcad856d7bcbf0050f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a42eed_7b79630b519d4fefb879eec6105a64ff.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8e7730_322b95913fc34db7babf5a49d75562c9.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ffe0d3_b6d5e72b5a6d4ab9a82dd1c5aac0d749.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/1df9ea_c390c268271c448f9425bc7e18a7b187.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/38955b_d8ea2eee9caf48bb9e2b5c03106cb47f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8e1900_658bdea7db0f417da790bf56bf7cfdf8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/822ecd_31d7a61586964f31bf761d1169c6d163.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2ca22b_05e89aced4014e6ca659423b15f51591.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4996/8035/files/dale_earnhardt_collectible_cars_value.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2176/2723/files/pafufasuletobebodigerazo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1477/3141/files/pojesole.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3759/6580/files/calling_code_font.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1052/2277/files/broome_street_academy_uniform.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53A2 5360 bytes
SHA-256: 27a74847695dc0484df31437d491633e2b9d8963e4df7b48a5962434c6e1a389
font_01_sfnt_off000065e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65E1 9936 bytes
SHA-256: 385228100582a172fc3cbf8ccf86b3fd0ba541bac2d021bd100757d34ec4bb9e

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