Malicious PDF — malware analysis report

Static analysis result for SHA-256 188900f07ae07707…

MALICIOUS

PDF

37.0 KB Created: 2020-08-08 09:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6e5719479c96285aaf0f0331b77187e SHA-1: edfae93e684a8441710c8331d04081e2153b792e SHA-256: 188900f07ae077074ef1d9f408805efddbab796bfe5a2052b6d34f9b2d892ba5
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or phishing campaign. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=yearning+for+lightness+pdf
    • http://xolap.jasontoonwrites.com/uploads/1/3/2/6/132681501/4167794.pdf
    • http://files.talkeasy.org.uk/uploads/1/3/1/3/131380128/04033f7d.pdf
    • http://files.heritageecc.com.au/uploads/1/3/1/3/131384468/a2ac09ae953e3.pdf
    • http://files.jc-engineering-solutions.com/uploads/1/3/0/7/130739076/8345195.pdf
    • http://files.jonnywilderness.com/uploads/1/3/1/4/131452804/gemeni_kexodipav_dejuwugazexi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/9040/1685/files/silonudazugesiduzimow.pdf
    • https://cdn.shopify.com/s/files/1/0429/9443/4202/files/zoxezofadejo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7216/7841/files/goxovaxilivizogezage.pdf
    • https://cdn.shopify.com/s/files/1/0431/0247/0306/files/wenapo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gevuruliwineda.pdf
    • https://cdn.shopify.com/s/files/1/0447/5843/3943/files/cet_key_answers_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/8669/1998/files/84525649803.pdf
    • https://cdn.shopify.com/s/files/1/0440/5942/6968/files/asme_y14_5m_2020_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6667/8686/files/15766832766.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_off0000540d.bin
9cea6426afae10fea4d097af67ce97e92a148d0792f7772cb4543a29418a2b0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x540D 5264 bytes
font_01_sfnt_off000065ed.bin
c21718ef4874204d7a7bcd5b1b76a2a12742093a670913c3b25d3c6a27813c80
pdf-font-stream PDF embedded font (sfnt) at offset 0x65ED 9852 bytes