Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d596b901f8cb687…

MALICIOUS

PDF

44.7 KB Created: 2020-11-06 16:49:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f837918c7416ba3030ffccf795b6f8f3 SHA-1: 5d57a8b25fef2f8c9efc6841879da73104fd5823 SHA-256: 7d596b901f8cb6878e2a46ad5b72b4f958639f8820d7cda749173dbc7124a911
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are to WordPress-hosted PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://traffnew.ru/aws?keyword=worm+farming+guide', is directly embedded and flagged as a potential malicious URI. While no scripts were explicitly extracted, the PDF structure and the presence of numerous links indicate a malicious intent to redirect users, likely as part of a phishing or content-farming operation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffnew.ru/aws?keyword=worm+farming+guide
    • https://cdn-cms.f-static.net/uploads/4419630/normal_5f9b11f4d0f19.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://manetomimexa.files.wordpress.com/2020/11/lugotorizereziwatogukomak.pdf
    • https://dogugomuvup.files.wordpress.com/2020/11/82308150569.pdf
    • https://uploads.strikinglycdn.com/files/e09b7952-5422-4728-a963-28011b40bc48/41693863831.pdf
    • https://zatejoru847961968.files.wordpress.com/2020/11/72489844693.pdf
    • https://paseneg.files.wordpress.com/2020/11/othello_norton_critical_edition_free.pdf
    • https://xanafegeze.files.wordpress.com/2020/11/rinizapowos.pdf
    • https://mutozofe.files.wordpress.com/2020/11/65548376527.pdf
    • https://s3.amazonaws.com/voropa/linkshell_chat_command.pdf
    • https://safopidupi.files.wordpress.com/2020/11/23812063554.pdf
    • https://fimalul.files.wordpress.com/2020/11/xenikefeg.pdf
    • https://uploads.strikinglycdn.com/files/0715b953-4dd8-470e-89af-aafbfb6d97d1/21679783981.pdf
    • https://s3.amazonaws.com/lefemijip/baja_california_norte_mapa.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007121.bin
a3e30772080b45adb4675334e9603a42646c1d9130a3609b923bbce3791dc79a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7121 5032 bytes
font_01_sfnt_off00008237.bin
9d84663461c439897c74512dc157909a1cf52d90464cacb9b1568739201c0e9a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8237 10620 bytes

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