PDF malware analysis — malicious · 38e5e2bc41f3d7fa

MALICIOUS

PDF

57.8 KB Created: 2020-08-14 02:03:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15

MD5: 96a21b8f6fd1170da7dd4a15fe075d44 SHA-1: e61da25c6b87c8f39fa6b766b6e9de55df86ea37 SHA-256: 38e5e2bc41f3d7fa8271076b67eda69ac91888dc2f2305377d15d6c88228bd8f

174 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics. The document body, though heavily obfuscated, contains a URL that appears to be part of a lure for job confirmation letters. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially harmful websites.

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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=job+confirmation+letter+template In PDF document text
- http://nasun.aworldinneed.org/uploads/1/3/1/3/131398453/f799e29aa816977.pdfIn PDF document text
- http://riwapivak.quietlegend.com/uploads/1/3/0/9/130969723/7028861.pdfIn PDF document text
- http://newojelus.freshperspectivenews.com/uploads/1/3/2/7/132712615/8054145.pdfIn PDF document text
- http://files.ritafeutl.com/uploads/1/3/1/8/131856827/gaxoleb.pdfIn PDF document text
- http://dokirid.freebirdbooks.com/uploads/1/3/0/8/130814328/2614673.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://cdn.shopify.com/s/files/1/0433/8050/6791/files/xujikokerekoredamavaz.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0439/0918/5688/files/72899763754.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0432/5031/9517/files/wavezanogusuwok.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0447/7042/7031/files/mimuzevamopalabuf.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0430/9313/1425/files/19270910820.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rinubigelezegir.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0434/0740/9310/files/bopevemimivugozinalotikos.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0429/2568/6951/files/golegezaniserobekupud.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0432/4474/8950/files/53697081588.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0441/3430/1848/files/42373334145.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0430/2897/1681/files/tugoxel.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0434/4211/0625/files/daxugaloge.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0431/6561/4234/files/70584543005.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0429/9970/9855/files/camara_colombiana_de_comercio_electronico.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0433/9056/6556/files/fundamentals_of_financial_accounting_4th_edition.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000923f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x923F	2828 bytes
SHA-256: `dd7b880f1c6958317b71933e3175eb4154b1281d355b69180e4ce829e506ee21`
`font_01_sfnt_off00009c39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9C39	5112 bytes
SHA-256: `0f5746397108bd32870bf5ad7cfaafb91e6517b360d29b1878c91db487f1e761`
`font_02_sfnt_off0000ad7e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAD7E	13492 bytes
SHA-256: `301785b96894adfefccc76043421faeabe1ba4790df0fcfe3e6f1f0a2e160b50`

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