PDF malware analysis — malicious · 18a68cbf49492acd

MALICIOUS

PDF

46.1 KB Created: 2020-10-27 10:10:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26

MD5: dbbcdfd0ab5280b53d693b3d6f0990d0 SHA-1: bfb1e6f0a96543c94c956dd272fd2b89d964c265 SHA-256: 18a68cbf49492acd007afb331a6536a87cde4f3a8da310dabc843c4380237f0f

154 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 S3 buckets and appear to be part of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector link, suggesting an attempt to lead users to malicious content. No scripts were extracted, but the PDF structure and link farm indicate a phishing or redirection attempt.

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://cctraff.ru/strik?keyword=identifying+prepositional+phrases+as+adjectives+and+adverbs+quiz In PDF document text
- https://cdn-cms.f-static.net/uploads/4416512/normal_5f96fc2425b11.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4375705/normal_5f97a7ecbf07b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366316/normal_5f95a91e8923d.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4375528/normal_5f8d0bdd35fff.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369307/normal_5f93eb8439cec.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366347/normal_5f8a6d45e2ee8.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369935/normal_5f92ff8aa1864.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://s3.amazonaws.com/jiguwuzobozobaz/addis_ababa_university_masters_program_entrance_exam_2018_19.pdfIn PDF document text
- https://s3.amazonaws.com/jamokaroxoj/fizevotafile.pdfIn PDF document text
- https://s3.amazonaws.com/fasanag/boxuwutedagejufanoxutok.pdfIn PDF document text
- https://s3.amazonaws.com/dogazisuze/automatic_door_lock_using_arduino.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0486/6424/8470/files/ziwosekajosopuletakisi.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0484/6898/3969/files/45630401597.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0501/6295/8517/files/deutsch_ben_lesen_schreiben_a1.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0499/9964/2793/files/best_wonderswan_emulator_android.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0266/9087/9667/files/phantasus_arno_holz.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0491/5540/8071/files/lyrical_ballads_by_william_wordsworth.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0432/5477/5970/files/mupemarijujurovopix.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/ea2a74fa-cecd-4e2f-9f0b-2b3ce3e93c8f/malayala_manorama_year_book_2019.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/122b2e0e-b47c-4d9f-b0d8-3534cb1678be/79836474996.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0c4cb20a-5467-4d46-9caa-a6df3fa9e250/tikakiniwatu.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_off000065dc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x65DC	5788 bytes
SHA-256: `edd04ef45cf1649b921bf18f1cbfacd38875c9adfe012df86d6d237dfebf7d48`
`font_01_sfnt_off00007991.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7991	10276 bytes
SHA-256: `152856613c4f694f0202724ee4cbe6b4b8e21c6aa41ac034b6f54f0d95c0d82d`
`font_02_sfnt_off00009c62.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9C62	4324 bytes
SHA-256: `a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f`

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