Malicious PDF — malware analysis report

Static analysis result for SHA-256 1244aa933e3c39bf…

MALICIOUS

PDF

46.9 KB Created: 2020-07-31 10:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b51825d876985bfeddd01abbfd0c5165 SHA-1: 21d77d112d5d545c2eb07c50daeea1491172a35f SHA-256: 1244aa933e3c39bfc6c55195b073eeeb864ac007438223ef9cb8b747b64359e1
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 heuristic specifically identifying it as a 'PDF SEO Link Farm'. The primary URL points to a known malicious redirector, suggesting an attempt to lure users to malicious sites. While no scripts were extracted, the presence of numerous links and the ML classifier's high confidence indicate a malicious intent, likely related to phishing or malware distribution.

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=importancia+de+la+tecnologia+educativa+pdf
    • http://files.rbdist.com/uploads/1/3/1/3/131398308/letafetasugako.pdf
    • http://files.economicprojects.com/uploads/1/3/0/7/130740011/f0c454cee276.pdf
    • http://files.onesacredmedicine.com/uploads/1/3/2/6/132681671/06dccf212533242.pdf
    • http://files.sequoiabrigadecamp.org/uploads/1/3/2/6/132695432/2543933.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/5203/9324/files/90257466544.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2708/files/27796466563.pdf
    • https://cdn.shopify.com/s/files/1/0431/4375/7992/files/22574987531.pdf
    • https://cdn.shopify.com/s/files/1/0440/5608/4630/files/47026123230.pdf
    • https://cdn.shopify.com/s/files/1/0437/1100/4821/files/76382153601.pdf
    • https://cdn.shopify.com/s/files/1/0431/2757/0596/files/82839764205.pdf
    • https://cdn.shopify.com/s/files/1/0437/3970/9605/files/56833845789.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mipubafuminidumef.pdf
    • https://cdn.shopify.com/s/files/1/0434/2792/2076/files/nejowajobalerudiwive.pdf
    • https://cdn.shopify.com/s/files/1/0435/8553/6159/files/99326686353.pdf
    • https://cdn.shopify.com/s/files/1/0429/6074/8695/files/kepezigozifuvefasej.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_off000077db.bin
da045a63b7c9bc2848fe6e4df5c77829f66ffc89c81fc7956147fc997ca8bb15
pdf-font-stream PDF embedded font (sfnt) at offset 0x77DB 5176 bytes
font_01_sfnt_off00008956.bin
c6ef29932541e88fd579783129e9a1faab0109f2073fa361e2110c23fe971e13
pdf-font-stream PDF embedded font (sfnt) at offset 0x8956 10928 bytes