PDF malware analysis — malicious · c796b65ce6bb975a

MALICIOUS

PDF

57.2 KB Created: 2020-10-22 18:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22

MD5: 1a8827570f3aa0caefc24f6b77e99f72 SHA-1: 675ac2e6e48188482ccd8529080d48609237a70c SHA-256: c796b65ce6bb975aa31a43e14f875091dba8496063a5346633af9816213a06d6

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to Excel VBA and a URL that appears to be part of a link farm designed to attract search engine traffic. This suggests an attempt to direct users to malicious infrastructure under the guise of providing technical information.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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://ggtraff.ru/wb?keyword=change%20the%20active%20worksheet%20in%20excel%20vba In 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/1/0484/1871/7864/files/41945068162.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0480/7933/9672/files/tolleys_yellow_tax_handbook_student_discount.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0434/0813/0213/files/wigirov.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0432/7761/5270/files/apk_for_pc_games.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0496/1465/1559/files/87309108403.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0490/0778/8199/files/reading_problems_and_solutions.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0500/3739/1558/files/gestion_du_stock.pdfIn PDF document text
- https://cdn.shopify.com/s/files/1/0266/8104/9274/files/fizilogamom.pdfIn PDF document text
- https://s3.amazonaws.com/xanebavifamopez/wing_chun_fighting_techniques.pdfIn PDF document text
- https://s3.amazonaws.com/zetare/wikodizopolilisa.pdfIn PDF document text
- https://s3.amazonaws.com/mibiwivanetuj/les_neurones_cours.pdfIn PDF document text
- https://s3.amazonaws.com/mijedusovineti/49316213648.pdfIn PDF document text
- https://s3.amazonaws.com/wuniku/91335160339.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d9c963a1-0044-427d-b483-c64648b08ed6/bodeted.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/fbf7a2f1-f477-4d33-84d7-0a3b2fbf01a5/15782372921.pdfIn PDF document text
- https://s3.amazonaws.com/kavitokolezub/autocad_2007_2d_basic_tutorial.pdfIn PDF document text
- https://s3.amazonaws.com/fasanag/properties_of_benzoic_acid.pdfIn PDF document text
- https://s3.amazonaws.com/mijedusovineti/jeboragagitibonorunez.pdfIn PDF document text
- https://s3.amazonaws.com/mibiwivanetuj/bakamelu.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/2c3a272b-f308-4fda-b30b-b7c82de8c40b/54566317531.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/4e285a32-108e-43d1-abd2-1749c498ad32/taxivivujujan.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/73f4a378-0707-40ed-a2dd-9a63ccb9edf1/ciencias_auxiliares_de_la_criminalistica.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/76e6fce2-c030-47f0-9ee7-65f924ee464d/19865733512.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://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_006_off0000ac63.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xAC63	24436 bytes
SHA-256: `66409e3fb1f29bf3804cde36be342ece6d4ed2116fa90505ad9df256f1594064`
`font_00_sfnt_off00006ca4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6CA4	5388 bytes
SHA-256: `c47cfef054b2e1541720184555290f3c21e0879fe3b8bfbcf415c6675db3c481`
`font_01_sfnt_off00007eff.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7EFF	2076 bytes
SHA-256: `e6b41424cbfbab56785d1d111fff896518f16f9ecc2d4d57a6cdabbdaf1573d2`
`font_02_sfnt_off0000880d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x880D	10764 bytes
SHA-256: `0fc2a525f01bba672fdf0c549a4de1788d0fd8ea5a45377256c4f272be25fea9`

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