Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8419fcc456eccd…

MALICIOUS

PDF

43.9 KB Created: 2020-09-10 22:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b460b8f3afddfd7a760b9e344ec4680d SHA-1: e84ad2ea2317d5f79dd9841eea60357f7de3078c SHA-256: 4f8419fcc456eccde749dea58aeeca45f0ff18ea8d76a3e5e2a67a07afa6d46e
154 Risk Score

Malware Insights

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

The PDF file contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged the PDF as malicious with high confidence. The document body, though heavily obfuscated, contains the same malicious URL, suggesting a phishing or scam 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=ap+sachivalayam+official+notification+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/0047a4_8fcb368bd1ca4c6d9efd104d05eb7bb6.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2994dd_20f149ec656a4c26b1a8fd74633c95de.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/eb4c03_77be6a1e2ce141a4bdac8c6b364eaefb.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9219f8_1d12b0e9af0e4890a3709d949639a090.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4234/8949/files/sojenapake.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0159/3505/files/kekowow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6737/5777/files/29095335395.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/4640/2198/files/ios_13_public_beta_5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9c58c5_0183393add9447068c888995913968d8.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/6a44d8_e3671397bf414b4e8d70c0dc2d52fffd.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/e2a635_7c8271d8bdf442eda0eacbf82e767fd7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/a421e3_635c78d54fac4d02baecebf2e080be2f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/2074c9_06d0523e91544f349c2d0a872f426ac3.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/9cb927_d4df6cb6d2a04b08948fd53c26ece379.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ab63e3_bb1fbf072c63488abc5fa617113d0556.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/837d34_8182c1c6db8d445b869847a9390605f7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_8c37149fb4284a5ab6f438377b4050a9.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_off00006718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6718 5448 bytes
SHA-256: 4b7b0f88b05ac00c9fbd3bc6da269e1d5c7e00675b835886e051059177e605d4
font_01_sfnt_off00007995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7995 12848 bytes
SHA-256: d43dc07531d98ea02c2527824e5d410dbb5af32d0942f2ccbe643560c7aaebc3

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