Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82a2424379124f5…

MALICIOUS

PDF

42.7 KB Created: 2020-09-10 13:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee8a0b3d30c749750dfd77912c2d4888 SHA-1: 11a4729033f03aeeafce348305c41fe7bcb90c5a SHA-256: b82a2424379124f5de99334dadd2c2bddc8e6369353b52de201d94d0df8391c7
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to external resources. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'https://ttraff.link/wix?keyword=count+duplicate+in+excel+sheet'. The document body also contains this URL, suggesting it is intended to lure the user into clicking it. The presence of numerous other links, while many are benign, contributes to a link farm tactic. The ML classifier strongly supports the malicious nature of this PDF.

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.link/wix?keyword=count+duplicate+in+excel+sheet
    • https://cdn.shopify.com/s/files/1/0450/4610/4222/files/oxford_discover_2nd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0429/9885/7891/files/vsphere_web_client_6._5.pdf
    • https://cdn.shopify.com/s/files/1/0438/7618/8315/files/81519058145.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3545/files/uniform_circular_motion_ppt.pdf
    • https://cdn.shopify.com/s/files/1/0430/8523/4338/files/new_baby_status.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/75283099474.pdf
    • https://cdn.shopify.com/s/files/1/0430/7897/5639/files/landslide_dixie_chicks_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/3830/2627/files/narasimha_swamy_photos_wallpaper_cave.pdf
    • https://cdn.shopify.com/s/files/1/0433/8499/5991/files/37327348594.pdf
    • https://cdn.shopify.com/s/files/1/0432/7846/7222/files/hp_elitebook_folio_1040_g3_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/9562/1786/files/914475715.pdf
    • https://static.usrfiles.com/ugd/e481ce_5b60e7a4d8774e6195ef280cde079dc1.pdf
    • https://static.usrfiles.com/ugd/5ea4d5_38489eb8aa0840f5856ac170d1744af9.pdf
    • https://static.usrfiles.com/ugd/3615fb_e1799d9e87ff4578b847f369141e7ef3.pdf
    • https://static.usrfiles.com/ugd/4c1554_4d61e2e2886548628f127709ba00b65a.pdf
    • https://static.usrfiles.com/ugd/4bdc6d_2418f652800a4a3c90f925f8104fd16a.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_off00006a87.bin
71c6aca43f5aea0b4acb987e9469a27d130a58b262aabe4eac7bb00abe2dd493		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A87 5036 bytes
font_01_sfnt_off00007ba3.bin
74311335e3e59073d872c68c07242af975b4102520439c3bb6fb8da5c16b5a86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA3 9964 bytes

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