Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d825ad2202f0613…

MALICIOUS

PDF

41.0 KB Created: 2020-09-03 05:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5ed6a5ee8032285ee74b72c925d0c4b7 SHA-1: b1fefedd7debc2386da0f13d73a6f9cae9b875fe SHA-256: 3d825ad2202f06136db1fa66ebb1866cf0cd72e3ca74139cae46fcd8de2e7862
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a crochet guide that redirects to a malicious URL, indicating a phishing or redirection attempt. The presence of numerous links to external PDFs, many of which are benign Shopify links, suggests a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious.

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=crochet+stitches+guide+australia In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2768/5798/files/centos_release_6._9.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/2915/0368/files/68443034259.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/wawebim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3705/6411/files/85249140293.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/3239/6200/files/gumoxagu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8221/1735/files/rojuwuwurugajixew.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0462/7680/4768/files/38950122228.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5197/3799/files/inverse_emulsion_polymerization.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2427/7923/files/sothink_movie_dvd_maker.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5010/4982/files/944_area_code.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/02beb7_59b369ff46a2480f99cf601e018732a7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ca300b_66067147cb6b4281a17f023879125b1c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_a3fad402974c48eda4ff995286b5a2a6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/87fdc7_e71d1fa9f3cd494a9f6f0804a21feae5.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_off0000632a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x632A 5104 bytes
SHA-256: 368f6fa3383355831fbcd266c8ece3796b54960cf337b9a048d12cb57ce79153
font_01_sfnt_off00007479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7479 10264 bytes
SHA-256: 3f6d138960b134ef3162b9cf414ae4bca099eef17032e822e1ffdba6c76d988d

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