Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ae039c4bf68555…

MALICIOUS

PDF

42.7 KB Created: 2020-09-01 08:06:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e6667bfaf1bb9d9939076de8ee13232f SHA-1: 0b8e607baff2860938f115b9756f9a5288a58894 SHA-256: 56ae039c4bf685557a9e2dba01d8fab613beae06e0e0e01b6e1f251338dfdc14
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which is likely used to lead the user to a phishing or malware distribution site. The document body, though partially garbled, contains text related to an 'open evening' and the malicious URL.

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/wix?keyword=kensington+aldridge+academy+sixth+form+open+evening
    • https://static.usrfiles.com/ugd/930050_ec60f98e21514a809ad834a2d217aebf.pdf
    • https://static.usrfiles.com/ugd/a838c0_6b8ad10195dd4e0689d3fb735c7ba1ad.pdf
    • https://static.usrfiles.com/ugd/cb5dea_eef6ef08299c4f50be452b5bf818f749.pdf
    • https://static.usrfiles.com/ugd/2813e2_925e58e715054914b12685875f3d474b.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4cc2e1d8739428d80427be9b2dc7698.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3482/files/envejecimiento_aparato_digestivo.pdf
    • https://cdn.shopify.com/s/files/1/0436/2895/3763/files/palabras_en_calo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4873/9740/files/79531028065.pdf
    • https://cdn.shopify.com/s/files/1/0432/9757/0980/files/sipofuzesevupe.pdf
    • https://cdn.shopify.com/s/files/1/0429/7421/6351/files/despacito_ukulele.pdf
    • https://cdn.shopify.com/s/files/1/0432/6811/2550/files/how_to_set_up_csgo_1v1.pdf
    • https://cdn.shopify.com/s/files/1/0433/9227/0494/files/manual_woodworkers_and_weavers.pdf
    • https://cdn.shopify.com/s/files/1/0431/4424/9499/files/classification_of_bacteria_according_to_bergey_s_manual.pdf
    • https://cdn.shopify.com/s/files/1/0437/3128/8215/files/updated_periodic_table_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/9322/0758/files/74786990146.pdf
    • https://cdn.shopify.com/s/files/1/0432/2285/9943/files/avengers_hd_wallpapers_1080p_iron_man.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_off00006727.bin
9e6dc3b7d4a0828b1dedc5cff0d876994382599d75c776e5cdcf7c16053c048d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6727 5768 bytes
font_01_sfnt_off00007abe.bin
793e4f3dc2bd12f43c7800109676e217ebcc355cd438b59da8d6b947c21c1706		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ABE 10132 bytes

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