Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b8d38efc9062fb7…

MALICIOUS

PDF

44.1 KB Created: 2020-09-19 06:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5aa541bb307091bc1a8ed9dbcda9b968 SHA-1: 777f006540a7dd229405061e008d702ec3b5f66e SHA-256: 2b8d38efc9062fb76ce2c72cf4dfa6a59d1c27482adc407cf63e0a2766996afa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded links, with one identified as a known malicious redirector. The primary purpose appears to be directing users to external resources, potentially for phishing or to serve as a link farm. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of its specific intent beyond link distribution.

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.com/wix?keyword=anti+school+block+games
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://8927e9e6-a05c-408b-92fd-e469fb3e9630.filesusr.com/ugd/370ea2_b75b5b0212ab44979365234ac9569f88.pdf?index=true
    • https://6d060421-35a5-4bc8-a16a-633cf1d7f5c2.filesusr.com/ugd/1e11d0_5f2487a01bfc4a48981341e036695510.pdf?index=true
    • https://5c0c99e4-64bf-4bab-a2d6-f8b30e944600.filesusr.com/ugd/51c472_0e489934fa2d4222a3f4096f16cac516.pdf?index=true
    • https://354ea178-d5c7-4fd9-a6b8-f007c572bfd7.filesusr.com/ugd/fedf23_68a969de178544a59ad0115075e47c75.pdf?index=true
    • https://5824d4f8-bab0-4652-abe0-f5a8235a94e0.filesusr.com/ugd/91e123_05a6cac80e0d41bcbbc51eaf09ebafeb.pdf?index=true
    • https://c1a44889-08d9-40f4-b8de-4ec5c163d5a4.filesusr.com/ugd/61b8bf_31f2bde833d64650857668a0252d607b.pdf?index=true
    • https://b6e62dd4-354e-4c0f-ac88-ded1101d6537.filesusr.com/ugd/1ee69b_bb6b8b6d0a6f445aa05904b64c347343.pdf?index=true
    • https://5a22b626-1e91-479c-bb11-ce171317a2c4.filesusr.com/ugd/359e64_9b475f9784a84606886578eaffcdf5d9.pdf?index=true
    • https://7db2078f-cb69-4cd4-8438-49c683143599.filesusr.com/ugd/38eac1_2675762e0d9b4c5c948c899a3d4450fa.pdf?index=true
    • https://39dc5276-3e95-4752-966c-b8cb76135a5c.filesusr.com/ugd/48d9a1_e300cb841e38412898a7f1bb7a35d10c.pdf?index=true
    • https://1b4bbfc0-5580-4f56-a981-24c9888290a6.filesusr.com/ugd/b65acf_3c3cbc74e6034d7f8a0a431a4149b0b0.pdf?index=true
    • https://830f3102-699b-4155-8769-715a47c6408e.filesusr.com/ugd/eddc50_cb6925cf5fe543e2b51bb21eec68ab3e.pdf?index=true
    • 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061b1.bin
304a85bf8d473eeee8a32490d0ba87ca1225fc0522603027a075b7225e5adbca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61B1 5096 bytes
font_01_sfnt_off000072d2.bin
1529a9f3e13386cdf51e75e05afb0941a901e559b0ac1399f2fc62d4d3255241		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D2 10268 bytes
font_02_sfnt_off000095e9.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95E9 4324 bytes

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