Malicious PDF — malware analysis report

Static analysis result for SHA-256 3731240894291d57…

MALICIOUS

PDF

53.3 KB Created: 2020-07-10 03:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26452e3eb81a71d3908d89f06a217615 SHA-1: aeef0053e5bef9a1b251572a2c8b097bb24c17c1 SHA-256: 3731240894291d57e80f049d27a4f417993f2d3edc6c86c03656269786bcde8c
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a link farm designed for SEO manipulation. One prominent link, 'https://ttraff.cc/wb?keyword=candid%20icse%20biology%20class%209%20textbook%20pdf', redirects to further malicious infrastructure. The document body, though garbled, contains keywords related to textbooks, suggesting a lure to trick users into clicking the malicious links. No scripts were extracted, but the PDF structure and link farm indicate a delivery mechanism for potentially harmful content.

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/wb?keyword=candid%20icse%20biology%20class%209%20textbook%20pdf
    • http://files.pyramidodi.com/uploads/1/3/1/6/131636746/8673200.pdf
    • http://files.circlepulse.com/uploads/1/3/0/7/130776698/186f604de23.pdf
    • http://files.thesolidrockshop.com/uploads/1/3/0/8/130813797/zaxisufibuxuxigusi.pdf
    • http://files.simplicitylavenderfarm.com/uploads/1/3/1/6/131606947/d252adc39044f49.pdf
    • http://files.plainbird.org/uploads/1/3/1/3/131380158/pufiw.pdf
    • http://files.connoisseurstours.com/uploads/1/3/1/8/131857071/abaa266e7dc9a.pdf
    • http://files.rashadsherman.com/uploads/1/3/0/7/130775983/kurasetod-gibigalab-mopufeme-jalukusav.pdf
    • http://files.bankersumbrella.com/uploads/1/3/1/4/131453252/e66e2d.pdf
    • https://simovojeb629202265.files.wordpress.com/2020/06/sikazuxopumevu.pdf
    • https://jekaxiwu.files.wordpress.com/2020/07/navuxepux.pdf
    • https://gupasuva.files.wordpress.com/2020/07/bekokolamin.pdf
    • https://finizagadi.files.wordpress.com/2020/07/bolob.pdf
    • https://zafujuzokud.files.wordpress.com/2020/06/fivipetekaliwelip.pdf
    • https://fugebetowipo.files.wordpress.com/2020/07/55881960265.pdf
    • https://nenidogava.files.wordpress.com/2020/07/52852316605.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32177526878.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/voxetevew.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/45927795399.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/98629167596.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuvekalododit.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/43545787384.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007afd.bin
2ef90d7084dbf46f67eafbf9c4b5d78d370491d73e649fb38b4ba3334efc2d8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFD 5568 bytes
font_01_sfnt_off00008e07.bin
c86977cf05a65d0186e15e181d9f43828473d12930dfafdc3fd6fa5f9e4e78fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E07 10532 bytes
font_02_sfnt_off0000b207.bin
2e17e5c29696205513e8f7fd5774d3daa0f3993f70f03e3ded2afc5570c652b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB207 6056 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.