Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d9e3ba0cd6bff1…

MALICIOUS

PDF

46.9 KB Created: 2020-08-04 01:48:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 777b5e92f1006eb49650f558e5b0548d SHA-1: 786e1b1c400a5e5b2277b5206f7d742b7cb612fc SHA-256: 76d9e3ba0cd6bff1bc237f5c8023962575610776235767e21e0f00261091329e
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common tactic for distributing malware or leading users to phishing sites. The document body, though heavily obfuscated, contains text related to 'free download' and includes the malicious URL, suggesting a lure for users to click and download further content. The presence of numerous external links, many pointing to Shopify, further indicates a link farm designed to attract traffic.

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.com/pify?keyword=cathode+ray+oscilloscope+pdf+free+download
    • http://files.acweinschenk.net/uploads/1/3/0/7/130775108/zurelaxakikakuk.pdf
    • http://redusoten.dignitywomenscenter.com/uploads/1/3/0/7/130739625/kinojewan_varijamenanikol.pdf
    • http://files.achirohealth.com/uploads/1/3/1/1/131163540/kigavinezenefenolar.pdf
    • http://files.crystelbeckerphoto.com/uploads/1/3/1/1/131164112/3cabe7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8300/5093/files/91010930750.pdf
    • https://cdn.shopify.com/s/files/1/0431/6489/3344/files/94939963197.pdf
    • https://cdn.shopify.com/s/files/1/0429/1624/9767/files/dexuxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/8706/8322/files/84858028264.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/99554040700.pdf
    • https://cdn.shopify.com/s/files/1/0431/9834/9471/files/vawimew.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/algorithm_design_kleinberg_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/82171466637.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4032/files/68948437347.pdf
    • https://cdn.shopify.com/s/files/1/0434/4591/1709/files/76242693449.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1796/files/76048986811.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_off0000795f.bin
9635d12a91b7bd5cad916817d5b1f8e4a53b403a40895108693d66ea10ce25d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x795F 5344 bytes
font_01_sfnt_off00008b9c.bin
9013e46734d4ac8a31f0ec4ec5a7975ca939ae4d6db935bd59615770ecb485b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B9C 10304 bytes