Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bc912992fe89cc2…

MALICIOUS

PDF

44.9 KB Created: 2020-08-08 00:25:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c86f05f64bc72fbc24189de58e48bac4 SHA-1: 1c45f503881fe175a66fc7fc093daad1cca40bca SHA-256: 0bc912992fe89cc2e194126e6bf7e9790e70cb1a87ca2e69b40f6e1c6a9780b1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to an internship certificate and the malicious URL. This suggests the file is designed to trick users into visiting a malicious site, likely for further exploitation or phishing. No scripts were extracted, but the presence of malicious links is a strong indicator.

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.ru/pify?keyword=modele+attestation+de+fin+de+stage+pdf
    • http://wovuxoti.acomputerconsultant.com/uploads/1/3/1/6/131606875/8193431.pdf
    • http://files.thepeterboroughparkwayclubs.co.uk/uploads/1/3/1/6/131606261/mesixagitisepab_gurewume.pdf
    • http://files.northhaledontreeexperts.com/uploads/1/3/2/6/132696558/333f9c9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/4460/9943/files/tesizopimogopozute.pdf
    • https://cdn.shopify.com/s/files/1/0432/6499/9590/files/zowewilololidabapeturunot.pdf
    • https://cdn.shopify.com/s/files/1/0428/6673/7311/files/oster_turbo_convection_toaster_oven_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/68403522105.pdf
    • https://cdn.shopify.com/s/files/1/0433/0491/1006/files/4022700915.pdf
    • https://cdn.shopify.com/s/files/1/0427/4031/8375/files/fedex_freight_employee_handbook.pdf
    • https://cdn.shopify.com/s/files/1/0439/3785/7691/files/beowulf_a_new_verse_translation_seamus_heaney.pdf
    • https://cdn.shopify.com/s/files/1/0438/8998/3643/files/wayne_dyer_books.pdf
    • https://cdn.shopify.com/s/files/1/0432/6018/2692/files/84492640608.pdf
    • https://cdn.shopify.com/s/files/1/0431/0604/2023/files/satevosakodez.pdf
    • https://cdn.shopify.com/s/files/1/0431/9795/6258/files/bullshits_jobs_livre_francais.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/gabemesib.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005fb5.bin
b5eaa3f5cfc4aa81851e990b3e9feae031597dfd09e3aa16ae208336cd9cfe33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB5 4904 bytes
font_01_sfnt_off00007082.bin
c5dd3e1698e9a396e012b4a8add8549eed716fc4e1637e968c7cb14ce8209174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7082 12156 bytes
font_02_sfnt_off000096a7.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96A7 4324 bytes

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