Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac1ff54e871890c…

MALICIOUS

PDF

33.1 KB Created: 2020-08-14 12:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 562b8edc269998408dd46db9b474e0a0 SHA-1: eae0177193ca1be812775bd746c03f852fd61ca8 SHA-256: 6ac1ff54e871890cb8bdec83f92222a66b79feb78bdb75cc0b2f36fa94287873
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, ttraff.com, which is disguised as an 'ionic bonding lewis dot structure worksheet'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this malicious intent. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of external links, many of which are benign Shopify links, but the primary malicious link is the focus. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence suggest a malicious document intended for phishing or malware distribution.

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.com/wb?keyword=ionic%20bonding%20lewis%20dot%20structure%20worksheet
    • http://wukinuran.simplydirecthealth.org/uploads/1/3/0/7/130776394/xawabin.pdf
    • http://xuwigo.zackannfitness.com/uploads/1/3/1/4/131482993/9388812.pdf
    • http://files.ovsassociation.com/uploads/1/3/2/6/132695536/dc078.pdf
    • http://files.lostbanditmedia.com/uploads/1/3/2/7/132740480/1087086.pdf
    • http://files.rebeccafalcasantos.com/uploads/1/3/1/3/131398332/674229.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/3644/1767/files/10432063933.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40369191557.pdf
    • https://cdn.shopify.com/s/files/1/0434/6370/4729/files/61794101735.pdf
    • https://cdn.shopify.com/s/files/1/0432/1614/2491/files/acer_aspire_5733_drivers_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0432/9114/8444/files/xadijok.pdf
    • https://cdn.shopify.com/s/files/1/0447/7416/2581/files/word_analogy_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/3873/4496/files/66265223330.pdf
    • https://cdn.shopify.com/s/files/1/0431/7285/5957/files/git_discard_all_local_changes.pdf
    • https://cdn.shopify.com/s/files/1/0435/2580/0087/files/widebo.pdf
    • https://cdn.shopify.com/s/files/1/0429/2762/0249/files/jisetijuku.pdf
    • https://cdn.shopify.com/s/files/1/0436/9452/2518/files/fijofimeza.pdf
    • https://cdn.shopify.com/s/files/1/0439/9484/1246/files/reporter_news_ethiopian.pdf
    • https://cdn.shopify.com/s/files/1/0428/5097/5910/files/36538809990.pdf
    • https://cdn.shopify.com/s/files/1/0434/3640/8982/files/solicited_vs_unsolicited.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_off000046aa.bin
f8fa57a30ad3d17b304a86ba73f89fdb9079df2531fe145735b76648cbb8d208		 pdf-font-stream PDF embedded font (sfnt) at offset 0x46AA 5224 bytes
font_01_sfnt_off0000587b.bin
b78ea6192f1e0da9f68d3ee72d89c5ca8c49b252bbf70e744de9560332f13309		 pdf-font-stream PDF embedded font (sfnt) at offset 0x587B 9036 bytes

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