Malicious PDF — malware analysis report

Static analysis result for SHA-256 19934e02939e4d6b…

MALICIOUS

PDF

76.0 KB Created: 2020-10-08 18:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 821a30609900eda705735aab7493e188 SHA-1: 7df5505429cc8c7d889948321103e26e5a96f1d5 SHA-256: 19934e02939e4d6b4992046fea828d55034217d747cd25effe0e7d714dc58ac1
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a malicious redirector link, identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK, which points to 'https://ggtraff.ru/strik?keyword=bssc+inter+level+notification'. The document also exhibits characteristics of a link farm, with numerous embedded PDF links, as indicated by PDF_SEO_LINK_FARM. The presence of a visual download button lure (SE_DOWNLOAD_BUTTON) suggests an attempt to trick the user into clicking the malicious link. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ggtraff.ru/strik?keyword=bssc+inter+level+notification
    • https://site-1038979.mozfiles.com/files/1038979/86468002925.pdf
    • https://site-1037085.mozfiles.com/files/1037085/15858359194.pdf
    • https://site-1038608.mozfiles.com/files/1038608/50966846610.pdf
    • https://site-1041295.mozfiles.com/files/1041295/wewamasisadikikigalubapi.pdf
    • https://site-1048482.mozfiles.com/files/1048482/petozed.pdf
    • https://site-1040428.mozfiles.com/files/1040428/93261928824.pdf
    • https://site-1037228.mozfiles.com/files/1037228/sagefuxefa.pdf
    • https://site-1036855.mozfiles.com/files/1036855/baxefagimuxirapan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0484/4686/5576/files/acids_bases_and_salts_quiz_answers.pdf
    • https://cdn.shopify.com/s/files/1/0427/5719/3895/files/99245760273.pdf
    • https://uploads.strikinglycdn.com/files/9c901d4d-af7e-460b-bd50-778ed5618633/nedifegenewe.pdf
    • https://uploads.strikinglycdn.com/files/05d4c0c0-8ce6-4e59-8213-c78b384ed9f0/tukipixovezirikomisexofa.pdf
    • https://uploads.strikinglycdn.com/files/9e6dbf1c-fec1-49ee-8207-e5049f491ec6/61440920045.pdf
    • https://uploads.strikinglycdn.com/files/7999ab8a-49cd-43b4-8369-aa6479fc1590/poxefajirevapurisanonufap.pdf
    • https://uploads.strikinglycdn.com/files/e1077685-a8aa-424b-b6e7-ba373643028f/vafizajuda.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000abc6.bin
d4a462e8f8f5b3b9f7b3a5a9a6143adb8c7ac1fa6fc10ac0a5495c56226199db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABC6 4772 bytes
font_01_sfnt_off0000bbfb.bin
b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBBFB 3720 bytes
font_02_sfnt_off0000c75e.bin
39a21e886a95ec0298f5029cb383ffd81d1aa99c075188f9d257d9f63140afd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC75E 15496 bytes
font_03_sfnt_off0000f73e.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF73E 4324 bytes
font_04_sfnt_off0001053e.bin
c60684ee470ce3cba0dbffe4b30b57f1937145125f0ac7cedada7949c0410cb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1053E 7644 bytes

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