Malicious PDF — malware analysis report

Static analysis result for SHA-256 53c93937f7e6fa05…

MALICIOUS

PDF

50.1 KB Created: 2020-09-03 01:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c60699c505bd51f27e48396d753208c SHA-1: 1a1f7ca4d3b012564b344b4b7d10104c8004467e SHA-256: 53c93937f7e6fa051cdae5f8b4b07b097a596fc2d9237882becea87ee41e13c0
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as a "sslc result 2018 tamilnadu marksheet" to entice clicks. The primary malicious link, https://ttraff.link/wix?keyword=sslc+result+2018+tamilnadu+marksheet, is a known malicious redirector. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's part of a link farm strategy.

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.link/wix?keyword=sslc+result+2018+tamilnadu+marksheet
    • https://static.usrfiles.com/ugd/e643da_14fcddbd418845b1bc39862e2be499cc.pdf
    • https://static.usrfiles.com/ugd/4d6844_c52d5bfd096742a7afc798f12e586b7b.pdf
    • https://static.usrfiles.com/ugd/a3b54b_55c1e4135e1b4ebbb98bd0d36e7597a7.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52665001447.pdf
    • https://cdn.shopify.com/s/files/1/0434/5823/2473/files/57591475319.pdf
    • https://cdn.shopify.com/s/files/1/0432/9065/6936/files/19992468669.pdf
    • https://cdn.shopify.com/s/files/1/0432/4940/2016/files/gukoverom.pdf
    • https://cdn.shopify.com/s/files/1/0429/1005/6615/files/fashion_report_ffxiv_week_73.pdf
    • https://cdn.shopify.com/s/files/1/0440/6440/7702/files/tetris_theme_piano_10_hours.pdf
    • https://cdn.shopify.com/s/files/1/0436/0136/3107/files/android_9_samsung_galaxy_a5.pdf
    • https://cdn.shopify.com/s/files/1/0434/1907/4722/files/16391707422.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/socket_head_cap_screw_size_chart.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8658/files/66198784793.pdf
    • https://cdn.shopify.com/s/files/1/0434/8706/8322/files/real_xray_camera_app.pdf
    • https://cdn.shopify.com/s/files/1/0452/2229/7760/files/92475877006.pdf
    • https://cdn.shopify.com/s/files/1/0432/6182/1092/files/xiragidepazurimedaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/6830/1212/files/salegebex.pdf
    • https://cdn.shopify.com/s/files/1/0435/6866/0643/files/pujiforogi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065c3.bin
14be5af56fafa252a98840a11748e896f33185cc87312852d717646f5812a108		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C3 5636 bytes
font_01_sfnt_off000078af.bin
c4f0000d78d747b3d129858618d547e13351c358565533559106775e993315ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78AF 5008 bytes
font_02_sfnt_off00008944.bin
4547b27e0315addd018b6f681395a7135e1fd78a7b12e7a407eee679bb0fac48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8944 10288 bytes
font_03_sfnt_off0000ac71.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC71 4324 bytes

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