Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b7fa447c81c3e1…

MALICIOUS

PDF

33.7 KB Created: 2020-08-05 15:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6653bb334a43ac668e5ef3c7745599d SHA-1: bcfb13835182b87b67459097f67a7851f93c134f SHA-256: 65b7fa447c81c3e106b9930e831e4cda477cdd30140b0806e837dc5fd528488a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain text related to 'Apc back ups 1500 manual' and includes the suspicious URL. This suggests an attempt to leverage SEO spam or a lure to redirect users to potentially harmful 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.com/wb?keyword=apc%20back%20ups%201500%20manual
    • http://files.mingcha.com/uploads/1/3/1/6/131606115/3153331.pdf
    • http://files.crystalriverpublishing.com/uploads/1/3/1/1/131164351/ead0e48eccb5.pdf
    • http://files.wavehogsurfshop.com/uploads/1/3/1/1/131163601/terikefejidibe.pdf
    • http://files.jrsamshoes.com/uploads/1/3/1/4/131453054/7372303.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0449/3528/2856/files/1989_ford_f150_repair_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/3012717594.pdf
    • https://cdn.shopify.com/s/files/1/0435/1649/3976/files/96243237546.pdf
    • https://cdn.shopify.com/s/files/1/0433/6936/5654/files/zetagugon.pdf
    • https://cdn.shopify.com/s/files/1/0431/3012/6490/files/soxotesufapumusewasadig.pdf
    • https://cdn.shopify.com/s/files/1/0431/3415/6967/files/88845337085.pdf
    • https://cdn.shopify.com/s/files/1/0430/8385/8080/files/simoun_episode_1_english_dubbed.pdf
    • https://cdn.shopify.com/s/files/1/0428/7977/8979/files/wasewili.pdf
    • https://cdn.shopify.com/s/files/1/0432/0762/2824/files/nosokisuridapetojamope.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_off00004496.bin
4a105cd00dcebe2eae4192357cd91807d2578d1445e4d743e3cf5cb0971f0afd
pdf-font-stream PDF embedded font (sfnt) at offset 0x4496 5492 bytes
font_01_sfnt_off0000573d.bin
00362d9213fd99ae4128c7306f449ccaacd9e9915a379b082be961eacfd6a701
pdf-font-stream PDF embedded font (sfnt) at offset 0x573D 10264 bytes