PDF malware analysis — malicious · c81bac5fda831b4d

MALICIOUS

PDF

55.5 KB Created: 2020-10-29 02:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14

MD5: ae8b3de90a66cb90cd13c05cd9ffc249 SHA-1: 2f1f72a8e7a18f1d09b0c9969e677f37a5470bfa SHA-256: c81bac5fda831b4d016bec8d36f1211ca657ef8d15736fd7d375230315428a13

144 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though obfuscated, contains text suggesting it is a 'ccnp switch lab manual', a common lure for phishing or scam campaigns. The SE_CALLBACK_LURE heuristic further supports a phishing or tech-support scam pretext. No scripts were extracted, but the presence of malicious redirectors and the callback lure strongly suggest a phishing attempt.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
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/123?keyword=ccnp+switch+lab+manual+2nd+edition+pdf In PDF document text
- https://cdn-cms.f-static.net/uploads/4372682/normal_5f8924670124d.pdfIn PDF document text
- https://nikoxutaju.weebly.com/uploads/1/3/1/3/131378952/9093369.pdfIn PDF document text
- https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/sovod.pdfIn PDF document text
- https://siregudak.weebly.com/uploads/1/3/0/7/130738759/farivogajod.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4385012/normal_5f972706bcb47.pdfIn PDF document text
- https://ritibamubube.weebly.com/uploads/1/3/1/4/131437410/6069018.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/1/0501/7275/6129/files/jojo_rabbit_streaming_uk.pdfIn PDF document text
- https://s3.amazonaws.com/vuraradaso/50707409375.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0483/5196/9443/files/sweetwater_guide_beer_carbs.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0494/2777/5655/files/what_obd2_scanner_does_autozone_use.pdfIn PDF document text
- https://s3.amazonaws.com/susopuzupure/gigedekeduvire.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0438/1684/5469/files/turbo_c_for_android_phone.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0437/3318/8762/files/national_appraisal_guide_for_mobile_homes.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/fe3d8f75-c46d-4e04-bc6e-3eb1505c88ad/manedogoduzeraful.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b9d253c8-0b06-4c44-a430-0a6a1d4fca46/radioactive_dating_practice_worksheet.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9f40c99a-d055-4b60-88ab-2582a9541fad/pufipo.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_off000089f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x89F3	5568 bytes
SHA-256: `9cbbe8cce0664da7cad53c8d1807b1b62f05c5712b0c265690b7a659d8f3937c`
`font_01_sfnt_off00009cc0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9CC0	10536 bytes
SHA-256: `157b7349892d9b70db49beabbfeb11c34ec1f4f2d907eb8e4fd4563c47747948`
`font_02_sfnt_off0000c09e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC09E	4324 bytes
SHA-256: `1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e`

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