Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bcf91601eb0007d…

MALICIOUS

PDF

48.6 KB Created: 2020-08-18 17:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df0da18daa85371e7870c11d33bbd21c SHA-1: 62b369acc9ecbb104d1bc3ff3ac25bbcfd79981e SHA-256: 0bcf91601eb0007de58ccae0341ae176ac7a1697416b7d8f443a4da37bc068a9
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a malicious site. The document body, though heavily obfuscated, contains the URL that is also flagged by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The presence of numerous external PDF links, many pointing to Shopify, suggests a link farm or SEO manipulation tactic to obscure the true malicious intent. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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.cc/pify?keyword=greek+islands+trip+report
    • http://files.jenniferkellett.com/uploads/1/3/2/6/132681969/ae9b1cbf11.pdf
    • http://files.tremormassagetherapy.com/uploads/1/3/1/6/131606343/97dc9253c3bad.pdf
    • http://files.dreamsupercars.net/uploads/1/3/2/7/132740408/dixukikebawone.pdf
    • http://wukojux.nullaginecrc.net/uploads/1/3/1/8/131857419/850c961.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/4575/6833/files/area_of_compound_shapes_worksheet_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/7121/7572/files/37872372656.pdf
    • https://cdn.shopify.com/s/files/1/0432/6572/0486/files/nejelanovuwixarokadela.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6864/files/14461347623.pdf
    • https://cdn.shopify.com/s/files/1/0430/3772/0733/files/dutugigelatikosuj.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dazekenikajupupapunel.pdf
    • https://cdn.shopify.com/s/files/1/0438/0885/0081/files/movie_trivia_quiz.pdf
    • https://cdn.shopify.com/s/files/1/0432/8721/6293/files/tamilnadu_election_commission_voter_list_2020_with_photo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0757/files/lonanix.pdf
    • https://cdn.shopify.com/s/files/1/0437/1467/4841/files/cisco_cwms_2._8_planning_guide.pdf
    • https://cdn.shopify.com/s/files/1/0437/8699/3816/files/ebstein_anomaly.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pusowa.pdf
    • https://cdn.shopify.com/s/files/1/0431/8098/2432/files/duredoboritu.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006933.bin
60694a83df36e547b7409a2970748038c1b71433da933f6b39c1e7639a925829		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6933 5048 bytes
font_01_sfnt_off00007a6f.bin
f0baa67612d17d71e954a95921627472871f2ff75cfa79d62d7f40faf755c1c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A6F 11544 bytes
font_02_sfnt_off00009fc2.bin
531e37f64a2e7dc3bfb257675d9e6c644c7b1597f33ba9a969cd005a7ed65660		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FC2 16312 bytes

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