Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a558f502e269aa…

MALICIOUS

PDF

42.5 KB Created: 2020-08-14 17:33:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c07dbbb4323f67e08b0c461bc83ddbd1 SHA-1: c85f397aa75e1067f5a5627e31282a861e335745 SHA-256: 65a558f502e269aafbc3c3fb52120247d417b7390820c980fcf1113168a9ae1d
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm designed to generate SEO traffic. One critical heuristic identified a link to a known malicious redirector, ttraff.com, which is likely intended to lead the user to a malicious site. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links suggest a phishing or redirection attempt.

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=kptcl+assets+and+liabilities+format
    • http://files.charleskalick.com/uploads/1/3/1/4/131410952/kevozuxuwuvexu.pdf
    • http://files.thejharrisdesigns.com/uploads/1/3/1/1/131163635/dekukovuxideda.pdf
    • http://files.busylilbeefloral.com/uploads/1/3/1/6/131606346/9a9f3b.pdf
    • http://files.deficientautobiographicalmemory.com/uploads/1/3/1/0/131070441/ccc83ff04.pdf
    • http://gotidim.thecheesesteakplace.com/uploads/1/3/1/0/131070036/tafutulovesidewo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/4388/7016/files/list_of_adjectives_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0428/7699/3702/files/chinese_characters_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/8079/4790/files/mukoworazaniwadip.pdf
    • https://cdn.shopify.com/s/files/1/0437/3810/3962/files/31706789656.pdf
    • https://cdn.shopify.com/s/files/1/0433/6284/4837/files/indeed_resume_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/3264/9636/files/10486419908.pdf
    • https://cdn.shopify.com/s/files/1/0432/7469/8912/files/kutiziwewu.pdf
    • https://cdn.shopify.com/s/files/1/0432/0192/1184/files/xodekavabodupo.pdf
    • https://cdn.shopify.com/s/files/1/0440/2606/9157/files/55310354559.pdf
    • https://cdn.shopify.com/s/files/1/0446/6917/3923/files/82368722729.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_off00006802.bin
119cbba00ca11380470e5a8c97c1d42e46a50cab6cd64ffa0eea07df36c89799
pdf-font-stream PDF embedded font (sfnt) at offset 0x6802 5412 bytes
font_01_sfnt_off00007a45.bin
a7bb3fb82429d10fcd7c3651551b356fe6da0f92eb122eb7410e656cbfaa9dbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A45 10080 bytes