Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cfbd483652a715a…

MALICIOUS

PDF

37.1 KB Created: 2020-09-06 00:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9939d3fdfe5b96740930ae22a0083bc SHA-1: f812f1f12cb36a78d070ce5811a6240490a02791 SHA-256: 6cfbd483652a715a354ec7f7e1389cbb237a35b7d504d87e7ca2dbbaab54c65a
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'crossword clue answers' and the malicious URL, suggesting a lure. The presence of numerous Shopify links, while mostly benign, indicates a link farm strategy. No scripts were extracted, but the PDF structure and malicious link strongly suggest an attempt to redirect the user to a malicious site.

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.club/pify?keyword=crossword+clue+answers+plodding
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/2483/4975/files/99641556932.pdf
    • https://cdn.shopify.com/s/files/1/0464/5073/7320/files/poxujivijobuzejuzija.pdf
    • https://cdn.shopify.com/s/files/1/0432/7515/7670/files/download_manga_studio.pdf
    • https://cdn.shopify.com/s/files/1/0439/8632/1566/files/49725781991.pdf
    • https://cdn.shopify.com/s/files/1/0433/8948/5221/files/evaluation_formative_module_6_aide_s.pdf
    • https://cdn.shopify.com/s/files/1/0428/1230/9671/files/pagitilawujatubafo.pdf
    • https://cdn.shopify.com/s/files/1/0430/5446/5175/files/kevin_gates_satellites_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0452/8862/0193/files/46387355494.pdf
    • https://cdn.shopify.com/s/files/1/0432/5045/0600/files/swot_matrix_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/6855/5415/files/hundred_years_war_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/4678/0566/files/74722334197.pdf
    • https://cdn.shopify.com/s/files/1/0433/5501/3275/files/sijoxogumutaboretule.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_off00004566.bin
bce260d11003d053c72b13c2e089b630d24455e9b9068335540a9ae9d2ec55e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x4566 5156 bytes
font_01_sfnt_off00005701.bin
34292fd52a3d0ce08c2e7a0ec2c38ba9222e94239fa7cec7c7fb0e0718651ef8
pdf-font-stream PDF embedded font (sfnt) at offset 0x5701 10108 bytes
font_02_sfnt_off000079a2.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x79A2 4324 bytes