Malicious PDF — malware analysis report

Static analysis result for SHA-256 85a674b2108c7699…

MALICIOUS

PDF

56.2 KB Created: 2020-08-25 00:55:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f4da1c36270c0b21eab31968887c88c SHA-1: 040aa8f153c6d957f89cb524a534347f524d793c SHA-256: 85a674b2108c76998ebf42b72d04a0dab96b3b053c57fef5b48a1a4655a8bbd6
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains text related to performance appraisals and the malicious URL. The presence of multiple external PDF links, including one to a potentially malicious domain, suggests an attempt to redirect the user to malicious content or download further payloads.

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=performance+appraisal+sample+overall+comments
    • http://files.thrivingdrs.com/uploads/1/3/0/7/130776204/5770433.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8199/0304/files/36413787671.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8373/files/cambridge_english_fun_for_starters_student_s_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/4392/9757/files/birmingham_city_university_postgraduate_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0441/0540/0472/files/suwoluz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7275/7670/files/2nd_grade_math_review_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0431/6420/5216/files/vekilo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0608/2717/files/sazumakerezo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2010/8455/files/37723751314.pdf
    • https://cdn.shopify.com/s/files/1/0432/8954/2809/files/gabimebemipebujegadaxiwik.pdf
    • https://cdn.shopify.com/s/files/1/0432/0470/6464/files/23474510819.pdf
    • https://cdn.shopify.com/s/files/1/0437/3177/9733/files/sazativogesopeguganoda.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/s_s_pandey_sociology_book.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_off0000a09e.bin
0914ffafcd720bf6c4e01eb3dedd6b67d3cf42f72a0f1585228f2105b5c450cd
pdf-font-stream PDF embedded font (sfnt) at offset 0xA09E 5220 bytes
font_01_sfnt_off0000b24a.bin
8a9bf0a784d4ad8ff1183eaed42bd7abb954635009b6f6ea07ad3c0b7588831e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB24A 9776 bytes