Malicious PDF — malware analysis report

Static analysis result for SHA-256 66888775acedecbd…

MALICIOUS

PDF

51.5 KB Created: 2020-08-21 18:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 24ecd59e3d28912b7cc0794f46786029 SHA-1: 2adc901adff7fe93ef7672294f21770f2ddb63de SHA-256: 66888775acedecbd9dfb34e1ed865034d36796220514ee1a2001068cbf5b2d13
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK, indicating a link to known malicious infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic suggests a large number of external links, many of which are likely part of a link farm. The embedded URL 'https://ttraff.ru/pify?keyword=accra+high+school+uniform' is the primary indicator of malicious redirection. The ML classifier also 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.ru/pify?keyword=accra+high+school+uniform
    • http://files.juhasorsa.com/uploads/1/3/1/8/131856987/4829535.pdf
    • http://wovadejij.kodachrome.net/uploads/1/3/1/4/131407558/lasomow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4686/3005/files/maxuxipowuparulupanezar.pdf
    • https://cdn.shopify.com/s/files/1/0431/0745/1041/files/subject_verb_agreement_all_rules.pdf
    • https://cdn.shopify.com/s/files/1/0432/5320/3102/files/miles_davis_kind_of_blue_zip.pdf
    • https://cdn.shopify.com/s/files/1/0432/2512/0927/files/sybil_book_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/6653/8649/files/40751660362.pdf
    • https://cdn.shopify.com/s/files/1/0431/1928/0288/files/classroom_management_book_wong.pdf
    • https://cdn.shopify.com/s/files/1/0432/1568/3743/files/88433397809.pdf
    • https://cdn.shopify.com/s/files/1/0437/8751/8104/files/rujefosopitonosozutova.pdf
    • https://cdn.shopify.com/s/files/1/0433/0579/5752/files/lokorunubivora.pdf
    • https://cdn.shopify.com/s/files/1/0431/5817/5895/files/railway_ntpc_form_status_check.pdf
    • https://cdn.shopify.com/s/files/1/0432/1509/3917/files/arteriografa_cerebral.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
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000691f.bin
f15e7f683b22395c586c799cb8824f2232bd8155166bd7e951aa81156e197946		 pdf-font-stream PDF embedded font (sfnt) at offset 0x691F 5284 bytes
font_01_sfnt_off00007aa1.bin
9af47a0553209b70096a984e313373b16f9274db3f023676752fa17de4cbf467		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AA1 6212 bytes
font_02_sfnt_off000089af.bin
f78f30a6513904762b69a6879f1a5d0d5f782b2418a770d5df691968b657df29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89AF 10012 bytes
font_03_sfnt_off0000ac2b.bin
35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC2B 16036 bytes

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