Malicious PDF — malware analysis report

Static analysis result for SHA-256 00c8c35af58a60de…

MALICIOUS

PDF

136.6 KB Created: 2020-08-24 21:11:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7d3afcff9196e5783e57983207f2bed SHA-1: fc25e5f48ce12671c0e99488bf459a8dd8aebd60 SHA-256: 00c8c35af58a60de4749db83eb3ff8b5f01bb159edebc500c1d43e3eb3b1f879
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains a reference to 'free chemistry notes form 2' and the malicious URL, suggesting a lure. The presence of a large number of external PDF links further indicates a link farm designed to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.ru/pify?keyword=free+chemistry+notes+form+2
    • http://files.nowakemusic.com/uploads/1/3/2/8/132815872/kazuwutomuluda.pdf
    • http://rugigok.newbostonphysicaltherapy.com/uploads/1/3/0/8/130814328/zibop_biwomodun.pdf
    • http://files.sailtrekker.com/uploads/1/3/1/3/131383330/aa983771b7.pdf
    • http://files.micksniseko.com/uploads/1/3/1/8/131857305/4e2d6.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/3440/2216/files/medical_dictionary_english_to_bengali.pdf
    • https://cdn.shopify.com/s/files/1/0429/5308/0991/files/62171995120.pdf
    • https://cdn.shopify.com/s/files/1/0434/1340/5850/files/bakitejewasuputodidimapa.pdf
    • https://cdn.shopify.com/s/files/1/0428/7148/8668/files/byju_app_apk.pdf
    • https://cdn.shopify.com/s/files/1/0438/1632/1184/files/76426100154.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/43734351066.pdf
    • https://cdn.shopify.com/s/files/1/0459/5951/2223/files/adobe_acrobat_reader_2018_offline_installer.pdf
    • https://cdn.shopify.com/s/files/1/0428/5172/9574/files/intermolecular_forces_activity_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/0158/5562/files/dubiro.pdf
    • https://cdn.shopify.com/s/files/1/0433/1172/6750/files/73652244009.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8375/files/15711240953.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c2e6.bin
34364a445d9522c84accdc39b8191821094d3530574c342a5224b6cab1120916		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2E6 1840 bytes
font_01_sfnt_off0001cb8b.bin
88934e5d5cfd20423760b1c80f48b09919fcaf0eae8c6ebe25c5e4aa99179a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB8B 4856 bytes
font_02_sfnt_off0001dbe8.bin
4d806788a8dce60508708e38f06891264a7736756fc6ce43f06ab8ca25b78148		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DBE8 13300 bytes
font_03_sfnt_off00020643.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20643 4324 bytes

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