Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a651b4a23091b46…

MALICIOUS

PDF

66.1 KB Created: 2020-07-29 22:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1753733fb9b3f3bdef92c51b02af6480 SHA-1: a2ee4613a727050e1ce87e8ca5eda100d79d39fd SHA-256: 5a651b4a23091b46efc39b931ee60df2894d8456e24ea81e4f38eacf82a1d94d
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The embedded content, though heavily obfuscated, suggests a lure for a free textbook download, aligning with a phishing or scam attempt. 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=oxford+textbook+of+oncology+3rd+edition+pdf+free+download
    • http://files.careers-nm.org/uploads/1/3/1/3/131382808/a4e7735f149fd8f.pdf
    • http://files.megaworldglobalcondos.com/uploads/1/3/1/8/131872269/4e8bf.pdf
    • http://files.importsunlimitednapa.com/uploads/1/3/0/9/130969080/e00c5007ae94.pdf
    • http://files.massagetherapyrelax.com/uploads/1/3/1/8/131856827/3043830.pdf
    • http://files.eyehearmusic.com/uploads/1/3/1/6/131637606/3214911.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/92481815521.pdf
    • https://cdn.shopify.com/s/files/1/0433/3748/2405/files/koxozejavonakaxupo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0093/files/bozurifagemobidemakovid.pdf
    • https://cdn.shopify.com/s/files/1/0432/6119/8491/files/jamem.pdf
    • https://cdn.shopify.com/s/files/1/0436/1748/4957/files/nenemuzokopubaxuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/4206/3004/files/69310205612.pdf
    • https://cdn.shopify.com/s/files/1/0435/5257/1555/files/78294588617.pdf
    • https://cdn.shopify.com/s/files/1/0431/4529/8074/files/68758120269.pdf
    • https://cdn.shopify.com/s/files/1/0436/8013/7369/files/16766057030.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27984898694.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4978/files/17439247906.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_off0000c555.bin
112c7b7dd48e4eeae1aa6d996c2064cf199ae7ff7b28544b59b5001dbcb0e222
pdf-font-stream PDF embedded font (sfnt) at offset 0xC555 5592 bytes
font_01_sfnt_off0000d88a.bin
cba7142e1a8d1081951f5b4dcff64c34da06909fae79a8863c0de8b2c2f71fb8
pdf-font-stream PDF embedded font (sfnt) at offset 0xD88A 9916 bytes