Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b25ad91f264d6a2…

MALICIOUS

PDF

42.0 KB Created: 2020-08-31 02:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36173ba406a47ff385c414a7352d3e0a SHA-1: fdfe86cbbe15cf1145081da16271a88fe9b8136b SHA-256: 4b25ad91f264d6a2261178b921bd7da26bc5fbb8ffa73f6fef38236524e5b1ba
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary malicious URL identified is https://ttraff.com/wix?keyword=ncert+notes+in+hindi+for+class+12+ch, which is likely used to direct users to further malicious content. The document body itself contains garbled text but includes the same malicious URL, suggesting a lure to disguise the malicious intent. No scripts were extracted, but the PDF structure and link farm indicate a phishing or redirection attack.

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/wix?keyword=ncert+notes+in+hindi+for+class+12+ch
    • https://cdn.shopify.com/s/files/1/0459/6219/9200/files/us_air_force_uniforms_history.pdf
    • https://cdn.shopify.com/s/files/1/0465/0873/6662/files/camberwell_assessment_of_need_can.pdf
    • https://cdn.shopify.com/s/files/1/0434/9735/7472/files/verizon_dbir_2017.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2677/files/arms_and_the_man_bernard_shaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/93116913981.pdf
    • https://static.usrfiles.com/ugd/b8c837_ad2a0f22c7be40129c68c2f642b7d6ab.pdf
    • https://static.usrfiles.com/ugd/c7a620_61b8fb4e5dd042339eeb542f4700b437.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/video_er_url_iphone.pdf
    • https://cdn.shopify.com/s/files/1/0454/1310/5832/files/dubilodexibagavunevoporod.pdf
    • https://cdn.shopify.com/s/files/1/0432/3826/0903/files/bulkhead_transformers_robots_in_disguise.pdf
    • https://cdn.shopify.com/s/files/1/0429/6504/1311/files/halls_of_ascension_lua.pdf
    • https://cdn.shopify.com/s/files/1/0443/8504/2598/files/cancionero_guitarra.pdf
    • https://static.usrfiles.com/ugd/b8c837_9fc0f95631f744759b2ac730f477f9fc.pdf
    • https://static.usrfiles.com/ugd/7598fa_9ea914dea4774b438806799665cacb5a.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000066c0.bin
7d72774087ceea179bcd5d0bf44304759e62366849766d7821fd27cae3fe0d9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x66C0 5264 bytes
font_01_sfnt_off00007898.bin
6787211a09afff2431be353724f6ae5c8cdff9e278b8df4e401863f007938eb2
pdf-font-stream PDF embedded font (sfnt) at offset 0x7898 10140 bytes