Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d1ca7a097595308…

MALICIOUS

PDF

44.4 KB Created: 2020-08-27 13:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 146b78124fd5e10b01f8ea76c3aa63ef SHA-1: a7bb86c1a42bcf72844741d1eb84a3b93a4317cb SHA-256: 2d1ca7a097595308a8676352ffcacea43aa78126c96b4ee3180a222660cdbc3f
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=the+immortal+life+of+henrietta+lacks+free+ebook'. This link is presented within the document body as a lure for a free ebook. The document also exhibits characteristics of a link farm, with numerous embedded URLs, many pointing to Shopify domains. The ML classifier strongly flagged this PDF as malicious.

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=the+immortal+life+of+henrietta+lacks+free+ebook
    • http://files.richandsandy.org/uploads/1/3/0/9/130969300/0908de8c.pdf
    • https://cdn.shopify.com/s/files/1/0437/1460/9303/files/actividad_epileptiforme_generalizada.pdf
    • https://cdn.shopify.com/s/files/1/0437/8945/1416/files/london_cycle_routes_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/0536/9768/files/jk_bank_po_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0435/9156/5471/files/41220830872.pdf
    • https://cdn.shopify.com/s/files/1/0437/1369/1799/files/31433741276.pdf
    • https://cdn.shopify.com/s/files/1/0431/9461/3924/files/assamese_song_free_video.pdf
    • https://cdn.shopify.com/s/files/1/0431/6823/5682/files/78795899425.pdf
    • https://cdn.shopify.com/s/files/1/0434/3955/4727/files/5724075256.pdf
    • https://cdn.shopify.com/s/files/1/0433/4885/2894/files/adjournment_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/4301/2256/files/ahlam_mosteghanemi_memory_in_the_flesh.pdf
    • https://cdn.shopify.com/s/files/1/0434/3988/2402/files/harpsicle_sheet_music.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_off00006f90.bin
1a7f6bdd4e5c1b4c772590e330f6718f48fe3106bd991f94344b58aa0489c3f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F90 5276 bytes
font_01_sfnt_off0000815a.bin
1353d917bd3d143e41b935883f4610dc1b4d20fe6993e181307981aec1b4bdda
pdf-font-stream PDF embedded font (sfnt) at offset 0x815A 10444 bytes