Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c432fb108512a0d…

MALICIOUS

PDF

50.3 KB Created: 2020-08-24 18:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 706f0c05fb8c23092119fade8194c3e8 SHA-1: 183827f7fef521f5382f3fc81265786acbd18895 SHA-256: 7c432fb108512a0d936f68267b2d330bc44244f2de298b67951cb0b4901b9c23
154 Risk Score

Malware Insights

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

The PDF contains embedded links designed to redirect users to potentially malicious content, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body text and embedded URLs suggest a lure related to "Bihar board 12th admit card" to encourage clicks. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector or phishing attempt.

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.cc/pify?keyword=bihar+board+12th+admit+card
    • http://files.borrowedheartsfoundation.org/uploads/1/3/0/7/130739974/miron-wuzipemarapu-najoxazararos.pdf
    • http://nojur.royackerskennels.com/uploads/1/3/1/3/131380828/8312371.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0433/7201/9877/files/desixagifis.pdf
    • https://cdn.shopify.com/s/files/1/0432/6427/8686/files/11432130401.pdf
    • https://cdn.shopify.com/s/files/1/0428/7810/7811/files/tovuxolajefiwexekowevuvoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0774/5958/files/massachusetts_rmv_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/3208/2594/files/74711480314.pdf
    • https://cdn.shopify.com/s/files/1/0432/5205/6227/files/logo_quiz_free_ultimate_guess_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/wiwirugaxumajizepipiwix.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068f9.bin
831cfca837a4e937fcc8939f86f09558ec331ef4b4cbde9a447fdf678621a058
pdf-font-stream PDF embedded font (sfnt) at offset 0x68F9 5340 bytes
font_01_sfnt_off00007afb.bin
fefa0d822720278e2e2b6416da97d4ebf0db42aa99e8f7a656dbced7c66cd751
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFB 12664 bytes
font_02_sfnt_off0000a3e3.bin
2730a5e62ed11968948a7de30a5fbb4ab89a0aefa33bf2605b6f47ae7349a415
pdf-font-stream PDF embedded font (sfnt) at offset 0xA3E3 7428 bytes