Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c23de65c7539787…

MALICIOUS

PDF

112.0 KB Created: 2020-08-21 09:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19d8a1067da2401e62c035ed4bdc05bf SHA-1: c48852b707cd15debcce8cc1c2c43d9d301c1e8f SHA-256: 0c23de65c7539787242d1e9ac9e273a6bf9d2125f6480a34ae353d413d08a6c2
162 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.cc, which is designed to lure users with keywords like 'idrivesafely final exam answers'. The heuristic firings indicate this PDF is a malicious redirector and part of a link farm, suggesting a phishing or scam attempt. While no scripts were directly extracted, the PDF structure and embedded links strongly suggest a malicious workflow aimed at directing users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=idrivesafely+final+exam+answers+2018+texas
    • http://viririgop.thesilentdoctor.com/uploads/1/3/0/9/130969204/8bbfc2a5.pdf
    • http://nonex.rosinakhan.com/uploads/1/3/1/4/131438044/4351726.pdf
    • http://files.jennybirmelin.com/uploads/1/3/0/7/130775192/61fa549958.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/7744/1438/files/kptcl_recruitment_2019_20_notification.pdf
    • https://cdn.shopify.com/s/files/1/0436/0349/3022/files/lixisijir.pdf
    • https://cdn.shopify.com/s/files/1/0433/7431/3633/files/relative_pronouns_worksheet_grade_6.pdf
    • https://cdn.shopify.com/s/files/1/0433/0792/5664/files/superior_drummer_3_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5142/files/friendship_story.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1096/files/murder_on_the_orient_express_putlocker.pdf
    • https://cdn.shopify.com/s/files/1/0437/7785/1550/files/avastar_free_2015.pdf
    • https://cdn.shopify.com/s/files/1/0433/6284/4837/files/d400_schedule_s.pdf
    • https://cdn.shopify.com/s/files/1/0432/5359/6310/files/14088831691.pdf
    • https://cdn.shopify.com/s/files/1/0434/4673/0904/files/chiefs_schedule_2020.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001557c.bin
9f68a4a527c4bd88b53f47b851318eddc3c4b519176815420eb5337df0e8d3f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1557C 3144 bytes
font_01_sfnt_off000160c2.bin
7f48470c891a608478f769d3e46cd9400e629356e2cd71584bd4d26ad5670633		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160C2 5832 bytes
font_02_sfnt_off000174aa.bin
443a6edaa3ab534227e8ee670dc0f3aa5bd4169ef57a25c1ea7a214aab9b22d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x174AA 12340 bytes
font_03_sfnt_off00019d40.bin
e9fe716c2abc985b12a899a49d5539e4e8be1b56d50c083b30290d85a2a7c848		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19D40 16092 bytes

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