Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ffad82904ec5ef…

MALICIOUS

PDF

45.7 KB Created: 2020-08-03 14:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fab06ee717f7b73fc63fc6368472384a SHA-1: b4a4154fb54f7bb98df14f95a3e57ec90e40cfed SHA-256: b5ffad82904ec5ef994dac802275ce5a9ccd01bfd078dc2fea9583ac37366db8
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to exercises and a URL that appears to be part of a link farm. The ML classifier also flagged this PDF with high confidence. No scripts were extracted, but the presence of malicious links suggests an attempt to redirect the user to a harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=exercises+after+total+knee+replacement+pdf In PDF document text
    • http://files.vernonrive.com/uploads/1/3/1/3/131379439/sutolamiwibako.pdfIn PDF document text
    • http://files.bodyvolvefitness.com/uploads/1/3/2/7/132712514/regozexidu.pdfIn PDF document text
    • http://files.biopharm-medicine.com/uploads/1/3/1/6/131606526/0a896d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7467/3050/files/gekerifi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3318/8759/files/83632584582.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1307/8168/files/2.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2313/0009/files/kansas_county_abbreviations.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4959/9651/files/johnson_50_hp_outboard_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gokibaleginasesomedusuj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/1915/6130/files/banur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/2107/2541/files/print_newline_python.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0193/6033/files/bidubolumesapixeg.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6923/5619/files/zumuxiluxab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6980/8535/files/pojuvigafuzomit.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4774/6721/files/zezepavusulumikatosaramul.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000675c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x675C 5176 bytes
SHA-256: 6d9b5fa6977f3b950ad64bffc138085346296066853d6e302d8a8600639a6764
font_01_sfnt_off000078d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x78D7 10172 bytes
SHA-256: 2b6cfa55c2f4d7fbf06012ad1f24883c1381c82b20afe48c3fcd8ac7fc4f684f
font_02_sfnt_off00009b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B8C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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