Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb22cf055e693e4…

MALICIOUS

PDF

50.2 KB Created: 2020-08-20 15:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49a4eb8d85a68dfe99d83cb805f26620 SHA-1: 32a92acfe5af8e67e4e71b58d384b6416eeea730 SHA-256: 0fb22cf055e693e48e437904525b5b890963eccaabf920bb182c7b70a8457628
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to benign Shopify URLs, but at least one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. This suggests the document is designed to lure users to malicious infrastructure, likely for further exploitation or phishing.

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/pify?keyword=falciform+ligament+axial+ct
    • http://wewekeg.annamiaz.com/uploads/1/3/1/4/131437626/mojulaworofuzefoz.pdf
    • http://files.tennantcreektransport.org/uploads/1/3/2/8/132813998/tofavib-xojapixoxipu-gotamixu-nelaji.pdf
    • http://files.utartstudentgallery.org/uploads/1/3/2/6/132682134/pilojesenenugu_zepunego.pdf
    • http://files.chwpress.com/uploads/1/3/0/7/130738779/mitinuz_sezuvomupiv_gasivapikotize.pdf
    • http://files.richstep.com.hk/uploads/1/3/0/8/130813829/nosikarirakox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/0805/7759/files/cartoon_guide_to_the_environment.pdf
    • https://cdn.shopify.com/s/files/1/0427/9622/0572/files/levajowijuwanivum.pdf
    • https://cdn.shopify.com/s/files/1/0440/2007/2613/files/wawabenubabezesofix.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/pendulum_chart.pdf
    • https://cdn.shopify.com/s/files/1/0432/6627/7534/files/81628817194.pdf
    • https://cdn.shopify.com/s/files/1/0437/7044/5975/files/applied_research_study.pdf
    • https://cdn.shopify.com/s/files/1/0432/3537/7307/files/modipejasumenibezed.pdf
    • https://cdn.shopify.com/s/files/1/0437/2915/8295/files/noduzoja.pdf
    • https://cdn.shopify.com/s/files/1/0427/5693/1751/files/64574900481.pdf
    • https://cdn.shopify.com/s/files/1/0439/3756/2779/files/60_state_street_wethersfield_ct_06161.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_off00007a0f.bin
8a03d60e8dae6592a3a32a6354ca14dd41d0967deed277ec5a9d090036f5dc13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0F 4836 bytes
font_01_sfnt_off00008a5f.bin
5eac5aa7998cc3dddf3e4da3af2104d35ec44dd6ed33a5ac2038183cea25b55f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A5F 10460 bytes
font_02_sfnt_off0000ae11.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE11 4324 bytes

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