Malicious PDF — malware analysis report

Static analysis result for SHA-256 756139f44769df32…

MALICIOUS

PDF

40.1 KB Created: 2020-08-02 22:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecfce888e94ae8f3e3ee9961d7cf3b9b SHA-1: 40968bd228bef019fd7bbc2d35e3564063449688 SHA-256: 756139f44769df32ea60445fa54e527cdcb80ee264e9d8216a5e7427e8b24ab4
154 Risk Score

Malware Insights

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

The PDF contains a lure for 'VMware license key free' and embeds a link to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, suggesting a link farm designed to attract traffic. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or redirection attempt, likely leading to further 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.ru/pify?keyword=vmware+license+key+free
    • http://files.america1funding.com/uploads/1/3/1/6/131637257/6963183.pdf
    • http://files.abookstudio.com/uploads/1/3/0/7/130740255/fugeduvevepo_dozutazi_wuxiki_rerozesifeja.pdf
    • http://files.catonsvilleptsa.org/uploads/1/3/1/1/131163943/47aef3c.pdf
    • http://files.fightroom.org/uploads/1/3/0/7/130775350/zajirufelapisize.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/6124/7129/files/xuxefasirijafaturoribuje.pdf
    • https://cdn.shopify.com/s/files/1/0431/7098/8188/files/sixodibizuwotudodepuvided.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/bexexeti.pdf
    • https://cdn.shopify.com/s/files/1/0429/7539/5993/files/ford_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/2143/4005/files/9830336730.pdf
    • https://cdn.shopify.com/s/files/1/0431/5126/1853/files/78935308634.pdf
    • https://cdn.shopify.com/s/files/1/0432/5038/5051/files/gejaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/8255/5297/files/mavaxusefeb.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/tafixu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/kajetadaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/liguwugazixejawud.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4969/files/13201078683.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_off0000567c.bin
c5f0d1210f16f46d9b035e7ab910ae8e2def3876ed5884dc7d4fd3c0629644ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x567C 5252 bytes
font_01_sfnt_off0000685a.bin
fa1f49e168ec4334c0442d39ba7ffc7ec5ae8d8166d348fc65f6f0db993ddba7
pdf-font-stream PDF embedded font (sfnt) at offset 0x685A 13692 bytes