Malicious PDF — malware analysis report

Static analysis result for SHA-256 e95535c83808e8cd…

MALICIOUS

PDF

37.3 KB Created: 2020-08-24 17:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8929ccc5f6ef71c03e7e0195db8ceff SHA-1: 9acf147a128eafdb7f1c9ae17b855cc6bb111c06 SHA-256: e95535c83808e8cd3737fd0a682886cec2da31c34c7d021b8f427cbb8e680adb
152 Risk Score

Malware Insights

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

The PDF document is identified as malicious by a machine learning classifier and contains a critical heuristic firing for a malicious redirector link. The document body, despite being obfuscated, contains the URL 'https://ttraff.com/pify?keyword=bohr+model+of+an+atom+worksheet', which is a known malicious redirector. The presence of numerous other PDF links suggests a link farm or a method to obscure the final destination. The primary attack pattern involves luring the user to click the malicious link under the guise of an educational worksheet.

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/pify?keyword=bohr+model+of+an+atom+worksheet
    • http://files.ravenlawson.com/uploads/1/3/2/7/132740362/6174504.pdf
    • http://files.premieractprep.com/uploads/1/3/2/7/132710569/9217704.pdf
    • http://sakevo.torontometabolicclinic.com/uploads/1/3/0/7/130776394/2848699.pdf
    • https://cdn.shopify.com/s/files/1/0438/4315/8166/files/kunajekunobefamubela.pdf
    • https://cdn.shopify.com/s/files/1/0428/5428/5479/files/zutujipuraxir.pdf
    • https://cdn.shopify.com/s/files/1/0441/3099/2280/files/islamic_banking_in_pakistan.pdf
    • https://cdn.shopify.com/s/files/1/0432/5824/9376/files/webusifelafezupo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8212/9320/files/7048503210.pdf
    • https://cdn.shopify.com/s/files/1/0430/2068/1377/files/agenda_2020_onu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9091/1137/files/bring_up_the_bodies.pdf
    • https://cdn.shopify.com/s/files/1/0435/6590/8123/files/81417114132.pdf
    • https://cdn.shopify.com/s/files/1/0447/5063/5162/files/acrylic_painting_techniques.pdf
    • https://cdn.shopify.com/s/files/1/0459/6354/2688/files/google_chrome._exe_free_for_windows_8.pdf
    • https://cdn.shopify.com/s/files/1/0431/7403/5607/files/amboni_caves.pdf
    • https://cdn.shopify.com/s/files/1/0434/5161/3334/files/91346539973.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_off00005457.bin
580448fb6e52fec20a04967fe9f97ae2d1d738a9465bf60106fe0003d7c0e01b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5457 5352 bytes
font_01_sfnt_off0000667a.bin
fedf6c65345c89d83c87b33ba6205a4fe39c30523d9f94804e849c098a240664		 pdf-font-stream PDF embedded font (sfnt) at offset 0x667A 10032 bytes

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