Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fea9137a76c2881…

MALICIOUS

PDF

40.0 KB Created: 2020-08-15 03:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9c7984c023ead83d5a8ee754b3b15fd3 SHA-1: 31aa46cba2585b6d2994f1c01a7a8991b87f7d81 SHA-256: 0fea9137a76c288133bcd779fae65a2ee0de7eb34a04d646bd5dae4b935cc470
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to external PDF files, indicating a link farm likely used for SEO manipulation or to host malicious content. One of the primary links directs to a known malicious redirector infrastructure at 'ttraff.com'. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded links and the redirector suggest an attempt to lead the user to a malicious site, potentially for further exploitation or phishing.

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/pify?keyword=graphing+trig+functions+worksheet
    • http://zefinaze.chippewafallspd.org/uploads/1/3/0/7/130738591/tinufonidin-xojututol-suwixakuza-lujazaf.pdf
    • http://files.alliancerestorationkc.com/uploads/1/3/0/7/130776309/dikiledawojetevedubu.pdf
    • http://files.phett.net/uploads/1/3/0/9/130969551/cabefe33072.pdf
    • http://files.marilynsyme.com/uploads/1/3/1/3/131383045/4781335.pdf
    • http://files.arroyooakshoa.com/uploads/1/3/0/7/130739951/kuzuz_gevebu_woxaxasite_gidon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/neretidesalefadim.pdf
    • https://cdn.shopify.com/s/files/1/0431/9982/4032/files/26104905825.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kitona.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/gotenurixuketojutaninebu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1336/4121/files/english_meaning_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/6009/9222/files/92592709415.pdf
    • https://cdn.shopify.com/s/files/1/0432/0018/4477/files/algebra_2_and_trigonometry_textbook_mcdougal_littell.pdf
    • https://cdn.shopify.com/s/files/1/0429/3397/7255/files/56628340898.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4704/files/womove.pdf
    • https://cdn.shopify.com/s/files/1/0437/9960/9505/files/ancient_egypt_state_and_society.pdf
    • https://cdn.shopify.com/s/files/1/0428/2223/8374/files/28637330101.pdf
    • https://cdn.shopify.com/s/files/1/0434/6681/7696/files/case_580_super_k_service_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050f3.bin
e80a1630bb144bedc7a46fecd9fdd95846b88e6ff181eaf73cdec442c79ab8d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50F3 5312 bytes
font_01_sfnt_off0000631a.bin
3b6dc23c271225e8590eb202ecb52ffa9c6c77ed60641737e0a0ee40068a761b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x631A 9884 bytes
font_02_sfnt_off000084ea.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84EA 4324 bytes

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