Malicious PDF — malware analysis report

Static analysis result for SHA-256 77afa823e97fc17c…

MALICIOUS

PDF

53.2 KB Created: 2020-08-09 06:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed233196b3dc3f1ec0f280463511f610 SHA-1: 8b8c2379c10d6e9999a8ff402e7dab93d0e1d7e8 SHA-256: 77afa823e97fc17c562d0642fe216b8a152baf6dba4d67bff739bdf273bf6913
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful content. The document body itself is heavily obfuscated but contains the malicious URL.

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://ttraff.ru/pify?keyword=ga+capsules+pdf
    • http://files.earthdaystinsonbeach.org/uploads/1/3/0/7/130775760/5430636.pdf
    • http://files.changinglyfemgmt.com/uploads/1/3/1/3/131384281/d615e6da4c4.pdf
    • http://files.nltbiblecollege.org/uploads/1/3/1/6/131606815/lumixulemowumasipeva.pdf
    • http://files.sturgeonenglish.com/uploads/1/3/1/8/131871433/4094021.pdf
    • http://files.coffeewgranddaddy.net/uploads/1/3/2/7/132710621/sigoso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0440/5959/0806/files/vuravipamasexoluv.pdf
    • https://cdn.shopify.com/s/files/1/0431/0564/8791/files/lonofulovisuzi.pdf
    • https://cdn.shopify.com/s/files/1/0430/4666/6389/files/codex_calixtinus_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/1052/2277/files/66989256826.pdf
    • https://cdn.shopify.com/s/files/1/0427/4136/6951/files/clicker_keypad_programming.pdf
    • https://cdn.shopify.com/s/files/1/0427/6387/8566/files/dininakekodawa.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7914/files/tosupigopodu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8003629611.pdf
    • https://cdn.shopify.com/s/files/1/0432/3170/7294/files/5447824591.pdf
    • https://cdn.shopify.com/s/files/1/0430/3110/1603/files/gobijega.pdf
    • https://cdn.shopify.com/s/files/1/0432/6106/7428/files/xazoxevawebo.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ff6.bin
7dd89f354d765d7dfc3168efb90ba67424e382b9eac38e583928a2edfa23987c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FF6 5084 bytes
font_01_sfnt_off00007157.bin
d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7157 3720 bytes
font_02_sfnt_off00007cba.bin
ad48e0aafb365a2defdd25b1f627f0f0e0fad2f0528ec62124d7a431f920d68d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBA 19572 bytes
font_03_sfnt_off0000b0d0.bin
eb9352ce3b15b1f52e29fc15a52177e4279ff400d76867c368c1054581a56893		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D0 5848 bytes

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