Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bd2acf5073de35c…

MALICIOUS

PDF

42.6 KB Created: 2020-08-15 02:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f90d4eb97e442ed6843c4f7af181743e SHA-1: d7e7818df24d822ae1bdf7e60ae20a08422fabf5 SHA-256: 2bd2acf5073de35c8af2a805ec84d4d9c7aacf350171b2c45d06b2eb3437b1e6
152 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic firing indicating a redirector to known malicious infrastructure. The primary malicious URL identified is https://ttraff.cc/wb?keyword=perbedaan%20muhammadiyah%20dan%20nu%20pdf. The document body, though heavily obfuscated, also contains this URL, suggesting the document's purpose is to lure users into clicking malicious links. The ML classifier strongly supports the malicious verdict.

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.cc/wb?keyword=perbedaan%20muhammadiyah%20dan%20nu%20pdf
    • http://mulal.timeundertensionwellness.com/uploads/1/3/1/4/131482952/wosina-dogukovomu.pdf
    • http://files.clwindowwashing.com/uploads/1/3/0/8/130873717/gevorisutile-wamip-puduzoj.pdf
    • http://files.carnegiereiki.com/uploads/1/3/1/1/131163718/pujuvewas.pdf
    • http://guxodoju.mightygreen.com/uploads/1/3/1/8/131857631/gefesukanowa.pdf
    • http://kigugipi.copelandcommunity.org/uploads/1/3/0/8/130814328/336a49e3b84600d.pdf
    • https://cdn.shopify.com/s/files/1/0433/8932/1366/files/rugigexofux.pdf
    • https://cdn.shopify.com/s/files/1/0435/8632/2593/files/11166755431.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/jotawetitixa.pdf
    • https://cdn.shopify.com/s/files/1/0450/4079/5806/files/counting_numbers_worksheet_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/ruff_ryders_anthem_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0450/9886/0707/files/brochure_mockup_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/3951/4015/files/animals_and_their_babies_worksheets_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0429/1851/0745/files/airline_industry_overview.pdf
    • https://cdn.shopify.com/s/files/1/0431/5463/6966/files/dinarefolodikes.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1573/files/67106773724.pdf
    • https://cdn.shopify.com/s/files/1/0432/1135/8372/files/diguguvaran.pdf
    • https://cdn.shopify.com/s/files/1/0428/2246/7750/files/candidiasis_oral_pediatria.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2470/files/xawosafowevezuzugebezix.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_off00006967.bin
99f45ed5db53f61deb839d0c7d522680be98493c7f078e3054c9a3d1ab925517		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6967 5312 bytes
font_01_sfnt_off00007b47.bin
aad70a85bbc06e361d0f462e4d43723307c13141134ce919b96bf22bd055ef73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B47 10044 bytes

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