Malicious PDF — malware analysis report

Static analysis result for SHA-256 77cf009b09a93cbe…

MALICIOUS

PDF

55.8 KB Created: 2020-08-25 10:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ccc37b1af82cdd062fc8420d9c6c65b SHA-1: 3afad7491658d8d9652e827cf1b947991514c801 SHA-256: 77cf009b09a93cbefac732281754f534000eac7413a1f0359cbee0a7500cde63
162 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text suggesting a lure for 'premium dating badoo apk free' and includes the malicious URL. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external PDF links suggests a link farm, a common tactic for SEO poisoning or distributing malicious content.

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=premium+dating+badoo+apk+free
    • http://vozeges.fumclaredo.org/uploads/1/3/0/8/130814328/fea313fbf5f9c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4040/7701/files/93705708343.pdf
    • https://cdn.shopify.com/s/files/1/0432/8158/0200/files/zuzasarevojekaruxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/38358463251.pdf
    • https://cdn.shopify.com/s/files/1/0436/4910/6073/files/world_map_outline_black_and_white.pdf
    • https://cdn.shopify.com/s/files/1/0437/2840/4632/files/warranty_deed_form_arizona.pdf
    • https://cdn.shopify.com/s/files/1/0430/7235/6514/files/76947413262.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/architectural_graphics_ching.pdf
    • https://cdn.shopify.com/s/files/1/0433/9079/5941/files/neumonia_por_chlamydia_trachomatis_en_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0432/1624/0807/files/online_music_library_project_report.pdf
    • https://cdn.shopify.com/s/files/1/0429/8768/4003/files/59224906732.pdf
    • https://cdn.shopify.com/s/files/1/0435/2360/4631/files/6770283448.pdf
    • https://cdn.shopify.com/s/files/1/0430/6993/1673/files/emblems_for_battlefield_4_com.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064c7.bin
2ce5a7286efefc5aae27ce1c31b3347e159d00bd30cf97f509a0b7f7d49caffb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64C7 6440 bytes
font_01_sfnt_off000074bc.bin
b76283313b31c8de6512c2dda2e71f0318dbd098741488e8081915508f728633		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74BC 5356 bytes
font_02_sfnt_off000086ca.bin
069da5ec3abaade5d1073bd01fe6df1a3e02035b7488b6a2927a593543616004		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86CA 3584 bytes
font_03_sfnt_off00009507.bin
cf620157001304c7db21cd4bf123afcc661cc0026f01c918bc999f8f97bb2510		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9507 11048 bytes
font_04_sfnt_off0000baf7.bin
89c4e6f4d9664fbd621897cc1e92e7726fec29a324beeb7a4197236a5d1145db		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF7 16504 bytes

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