Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed8ba3207c8d5086…

MALICIOUS

PDF

46.8 KB Created: 2020-08-17 00:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f632f9532cb3788fe735bd2bd9a68959 SHA-1: 7293b87ad026a7a9f94393c2a4a24581b61e654f SHA-256: ed8ba3207c8d5086ad6b16eadcf989ffbe1945203655e31244e335b09d9a15e5
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text related to 'Police bharti 2019 gujarat answer key' and the malicious URL, suggesting a lure to trick users into clicking the link. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, further supporting the malicious intent of redirecting users.

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=police+bharti+2019+gujarat+answer+key
    • http://finadif.sdcas.org.uk/uploads/1/3/0/8/130873741/2642242.pdf
    • https://cdn.shopify.com/s/files/1/0434/4902/4669/files/coleman_mach_rv_air_conditioner_troubleshooting.pdf
    • https://cdn.shopify.com/s/files/1/0434/2962/6017/files/rukipesefo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1849/2824/files/60031532643.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/35142658686.pdf
    • https://cdn.shopify.com/s/files/1/0428/7388/0739/files/81764872312.pdf
    • https://cdn.shopify.com/s/files/1/0439/1511/6696/files/storyboarding_101.pdf
    • https://cdn.shopify.com/s/files/1/0437/0500/8293/files/41786956958.pdf
    • https://cdn.shopify.com/s/files/1/0434/0865/4492/files/arbatel_de_magia_veterum_english_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/9183/5547/files/87344289635.pdf
    • https://cdn.shopify.com/s/files/1/0433/3164/9689/files/a_wrinkle_in_time_chapter_9.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/12815106185.pdf
    • https://cdn.shopify.com/s/files/1/0435/7524/7003/files/apprendre_chinois_debutant.pdf
    • https://cdn.shopify.com/s/files/1/0433/3702/3641/files/98880296745.pdf
    • https://cdn.shopify.com/s/files/1/0428/6719/6063/files/virukitaze.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_off00007603.bin
735c600741e6b2b0d5a61e287b23418b6ba7ce6ff2d535ed58cbff7f30595e7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7603 6020 bytes
font_01_sfnt_off00008a90.bin
0bc6cf133a80d6aa893eb6636ac2713c3de1d4993ee91cf179e2e37f82ebb4aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A90 10456 bytes