Malicious PDF — malware analysis report

Static analysis result for SHA-256 0815989be7315236…

MALICIOUS

PDF

46.8 KB Created: 2020-09-24 07:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4fd6af78bd236f3926a8e793180b6745 SHA-1: 45c26694a722657622cac6dc807fcc35e2d7e254 SHA-256: 0815989be73152366fde917c489850a2d724c18f74841789c24c45fd53756579
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack vector appears to be tricking the user into clicking the malicious link, which then likely leads to a phishing page or malware download. No scripts were extracted, and the document body was heavily obfuscated.

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.me/wix?keyword=simple+random+sample+worksheet
    • http://files.beyondthelands.com/uploads/1/3/1/0/131070212/jifukonapad_padedorojediwa_meduxe_palif.pdf
    • http://mibetudob.hempnu.com/uploads/1/3/0/8/130813330/jodotot_bukedovukulu_xedoxege.pdf
    • http://lebufan.earlgreen.net/uploads/1/3/1/6/131637136/3042357.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://02f0cbf7-61df-44da-aee0-34fba1c32760.filesusr.com/ugd/3724a2_1e2049ce7d4344548e68e68717663015.pdf?index=true
    • https://b52c9da3-21fe-4409-9f92-dd3330fe1d76.filesusr.com/ugd/10b11f_41fdf85136d049129083e1a455334e8e.pdf?index=true
    • https://3894792c-9812-41fa-aae6-4aab711643cd.filesusr.com/ugd/c844bf_228572362caa45ca9077fb32a9e4c342.pdf?index=true
    • https://ca526a74-ef6b-4576-9449-cd7649012943.filesusr.com/ugd/917232_2cd60a95aa74446c9b47ce68f959b26f.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0437/5448/7969/files/mean_streets_of_gadgetzan_crafting_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/4514/3206/files/angiotensin_receptor_blockers_review.pdf
    • https://6044106d-543a-4bc2-893e-783ff71b1b05.filesusr.com/ugd/92ee2b_cd458d8d2c4f494e9410a6da3586ff20.pdf?index=true
    • https://2f824977-b1e2-4008-a469-f50d14f3fa87.filesusr.com/ugd/f55bec_f931b80109e94a82b002d92adc2b8b0f.pdf?index=true
    • https://3d8e860a-69dc-45c7-8a12-5c13ad9ac5d0.filesusr.com/ugd/cb2bed_e587023e241248f090ed3ac2c3400277.pdf?index=true
    • https://05d9e9bd-849c-4b34-88d7-c86bdd26ece3.filesusr.com/ugd/e948c1_4ea34beae228496386706beb74273769.pdf?index=true
    • https://bf434c9e-4294-480f-8230-cd8c5140386f.filesusr.com/ugd/0582e0_a03541e2803f412d87a8cbd4f2847196.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_off00006c13.bin
63a9ed2ec02456313941cb7e71fefc92a8a4c418fd944baa011a3a9f9f4c3eb8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C13 5248 bytes
font_01_sfnt_off00007db5.bin
2f9211fdca5daf4a9e522472f62d69248b40ab1d9d5dd0fad06830beae1b72c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB5 10012 bytes
font_02_sfnt_off00009fff.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FFF 4324 bytes

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