PDF malware analysis — malicious · bd532dae32e0f826

MALICIOUS

PDF

46.2 KB Created: 2020-10-16 19:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20

MD5: 799167f93a656a9b607a066c250c4e19 SHA-1: ae2ef5a83a8c8d25dd49f24d620d67af6abd5adc SHA-256: bd532dae32e0f826019c6cb7f623230a246822704fd0a32f6acb98c78ae1379f

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document contains a large number of embedded links, many of which point to disposable hosting services and appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document's content, while appearing to be about trigonometric functions, is likely a lure to disguise the malicious link distribution. The primary goal seems to be SEO manipulation or redirecting users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9984

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.
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.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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://cctraff.ru/wb?keyword=derivadas%20trigonometricas%20inversas%20ejercicios%20resueltos In PDF document text
- https://misopiwulasi.weebly.com/uploads/1/3/1/8/131856666/murarofabesudo-sasab.pdfIn PDF document text
- https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/buposunonugilik-gupunonesawe-rugugukovedebo.pdfIn PDF document text
- https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/2ce09bf0ca48.pdfIn PDF document text
- https://keniwuki.weebly.com/uploads/1/3/1/4/131483234/gosibokuvefuj.pdfIn PDF document text
- https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/bagatazojiz_sidatasofugugor_sofaxazute_gureluf.pdfIn PDF document text
- https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/3731638.pdfIn PDF document text
- https://povutepumik.weebly.com/uploads/1/3/2/7/132741486/fakesonadusiza_nenuned.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4365607/normal_5f88f63746149.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369777/normal_5f88b61fd3848.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4375093/normal_5f8951a7bd910.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4365589/normal_5f86f4053534e.pdfIn PDF document text
- https://vogizezadu.weebly.com/uploads/1/3/0/8/130814341/tupis_dukunudeg.pdfIn PDF document text
- https://pixabetamomu.weebly.com/uploads/1/3/1/0/131070001/satutaja.pdfIn PDF document text
- https://jozokuxig.weebly.com/uploads/1/3/2/8/132814463/c385b3d7b86.pdfIn PDF document text
- https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/roruj-fegedevovelere-zexomojikazi-rewubujelem.pdfIn PDF document text
- https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/916761cf89a.pdfIn PDF document text
- https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/wirexanusir.pdfIn PDF document text
- https://fekudumubaf.weebly.com/uploads/1/3/2/6/132681201/d54f4d96cedca1.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/1/0430/5901/9933/files/sezabuwizimaxeviki.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0483/8332/8405/files/family_guy_through_the_years_dailymotion.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0431/4939/4080/files/virtual_blood_typing_lab_answer_key.pdfIn PDF document text
- http://scripts.sil.org/OFLIn PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005f72.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5F72	5396 bytes
SHA-256: `2a7fc028c2675891686c83c525311ab77633c8878a90e810f5afccfd634a18df`
`font_01_sfnt_off000071c3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x71C3	14716 bytes
SHA-256: `4ddcd9e818e48d33476e7d6e9a863127a24da52e61a5bd761da15b9baab09d96`
`font_02_sfnt_off00009f2c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9F2C	16440 bytes
SHA-256: `6289faca871cf87a3a7ce88749364a7779d6f710ee2e225bab432ecb275cf263`

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