Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b47b4bce47f6f27…

MALICIOUS

PDF

48.9 KB Created: 2020-08-12 03:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b02864f028262e10b4a78e4d047e0442 SHA-1: 7d591f47cfcdd5b371ce2ff3a6d094f27d828e8d SHA-256: 0b47b4bce47f6f27daef18ee2cb3719a64daf4cc85e298fc7ac191e47ef500f7
154 Risk Score

Malware Insights

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

The PDF contains a high number of external links, many of which point to a link farm designed to generate SEO traffic. One of the embedded links, https://ttraff.cc/pify?keyword=chaconne+segovia+pdf, is known to lead to malicious redirector infrastructure. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the link farm and redirector suggest an attempt to lure users to malicious content.

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.cc/pify?keyword=chaconne+segovia+pdf
    • http://balidazo.elginartsassociation.com/uploads/1/3/2/6/132683403/4389388.pdf
    • http://files.irishwinters.com/uploads/1/3/0/9/130969077/4545217.pdf
    • http://kowiwa.southernmarylanddietitian.com/uploads/1/3/0/7/130738546/6496101.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9005/9176/files/robujafuxanuviradaferafof.pdf
    • https://cdn.shopify.com/s/files/1/0440/2115/3957/files/worthy_of_your_name_chords.pdf
    • https://cdn.shopify.com/s/files/1/0434/2333/4565/files/34216352512.pdf
    • https://cdn.shopify.com/s/files/1/0439/2786/3464/files/31900596635.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6677/files/tutikatuwojajimar.pdf
    • https://cdn.shopify.com/s/files/1/0432/6057/5912/files/15139862198.pdf
    • https://cdn.shopify.com/s/files/1/0431/1964/0738/files/xizemanigiwinije.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/xefovolira.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/36937955276.pdf
    • https://cdn.shopify.com/s/files/1/0433/5376/8090/files/allan_quatermain_novel.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5469/files/99442636166.pdf
    • https://cdn.shopify.com/s/files/1/0433/2617/7438/files/los_proximos_30_aos_alvaro_gonzalez_alorda.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_off000081b0.bin
ee3267cee7fe307cdd45eb69f5f26ddd23ca07aa7055b02b9f436e63128ecc4d
pdf-font-stream PDF embedded font (sfnt) at offset 0x81B0 5256 bytes
font_01_sfnt_off00009393.bin
2101566d78dda15fd7cd1a26e7f1e0ec89e39ab88b61448782a84c10e283633f
pdf-font-stream PDF embedded font (sfnt) at offset 0x9393 10488 bytes