Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a68cc6662f207e…

MALICIOUS

PDF

42.3 KB Created: 2020-08-12 14:23:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31c2c892716fc222870eec12dae9a058 SHA-1: d0e40526c8a15cf63b135267150be5368ca1e3c7 SHA-256: 77a68cc6662f207ee7d9a1a147b0a191b2a6ffee2a77e5fc1ef7b89756cff022
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, masquerading as educational worksheets, that point to a redirector service. This service, in turn, likely leads to malicious content or further compromise. The ML classifier strongly indicates maliciousness, and the presence of a redirector URL confirms the intent to lead users to a potentially harmful destination.

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=addition+worksheets+for+1st+grade+pdf
    • http://files.westcentralcamp.com/uploads/1/3/0/8/130874535/3934753.pdf
    • http://files.krvbrugg.ch/uploads/1/3/1/3/131382274/revukewewaf.pdf
    • http://buvetaji.kansascityamprepair.com/uploads/1/3/1/4/131453501/bizupexebupafususef.pdf
    • http://files.itsmorethanjustasport.com/uploads/1/3/2/8/132815791/vavotul.pdf
    • http://files.summasportswear.com/uploads/1/3/1/4/131453807/118d8e22a22790b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/2378/5370/files/adding_polynomials_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/19859679841.pdf
    • https://cdn.shopify.com/s/files/1/0430/0832/7829/files/vexuxiwiwikoguruvuxuje.pdf
    • https://cdn.shopify.com/s/files/1/0433/8532/3683/files/39192086884.pdf
    • https://cdn.shopify.com/s/files/1/0431/1384/0793/files/19760365732.pdf
    • https://cdn.shopify.com/s/files/1/0433/3882/5887/files/74453548987.pdf
    • https://cdn.shopify.com/s/files/1/0433/0805/6740/files/30986797705.pdf
    • https://cdn.shopify.com/s/files/1/0430/4932/0610/files/89060884331.pdf
    • https://cdn.shopify.com/s/files/1/0436/3137/8590/files/management_aptitude_test_sample_papers.pdf
    • https://cdn.shopify.com/s/files/1/0428/4140/7644/files/palowelaga.pdf
    • https://cdn.shopify.com/s/files/1/0432/7332/2664/files/3x3_oll_and_pll.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_off000059c3.bin
2af63a1ad97a0961e5aac6e76546b69fe40eb4f6007127ac9888ebcd90b96b32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59C3 5256 bytes
font_01_sfnt_off00006bb6.bin
986be0a1836e17c39853ef544771ac7b72623229e641bbfe71f0818498ef533a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BB6 10048 bytes
font_02_sfnt_off00008e33.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E33 4324 bytes

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