Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f42beccd42f1781…

MALICIOUS

PDF

47.1 KB Created: 2020-09-18 02:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b1481b4da0e80c927d33a18f0cea84d9 SHA-1: 1986ad762fdceed309585cdb398849263da6ec3e SHA-256: 7f42beccd42f17816b28459f524b8492cc2311dcb9c6bb0128062059c3c82a89
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains numerous links to external resources, many of which appear to be part of a link farm designed to obscure malicious redirectors. The document body and heuristics indicate a social engineering lure to download an application, specifically referencing 'Mobdro download apk pc'. The presence of a malicious redirector link and the ML classifier's high confidence score strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.club/wix?keyword=mobdro+download+apk+pc
    • http://kaniloz.longtabbrewing.com/uploads/1/3/1/3/131398244/52fd9f72579.pdf
    • http://files.seanhancocklive.com/uploads/1/3/1/3/131398541/lotileku-mofoxalinugajus.pdf
    • http://xelesapug.ryderstudios.com/uploads/1/3/1/4/131453046/vewufan.pdf
    • http://files.sugarpanbakery.com/uploads/1/3/1/6/131607053/9462922.pdf
    • http://dukiteba.bridesburgoc.com/uploads/1/3/1/4/131406211/pivam.pdf
    • http://files.pacificcountyyouth.org/uploads/1/3/1/4/131438323/860604.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://01d352e9-bcd1-4e6b-8c4e-ecda974e89a8.filesusr.com/ugd/d90490_2f8ba45cf8cd49d49d15162a72d80e52.pdf?index=true
    • https://ba8e877c-36bf-4c4a-894d-7cd9531c0336.filesusr.com/ugd/41f880_61861992f672459f9b887b0467653bb9.pdf?index=true
    • https://b90ca2be-34f9-49c0-8607-293d5dee06c5.filesusr.com/ugd/b14caa_5b4d0d24082440b98b10e6300d961521.pdf?index=true
    • https://e61dbea1-708d-4270-b9f4-39cfe9c7a8b5.filesusr.com/ugd/f2ef67_cff113ae9c664e43a681c58d598e42ac.pdf?index=true
    • https://55877602-bc44-484f-b78f-07d45f338d9a.filesusr.com/ugd/957c7b_8ee84fdabf0540fc93997a457b83fa6f.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0429/1756/0473/files/87870374236.pdf
    • https://cdn.shopify.com/s/files/1/0433/9371/2286/files/derivation_of_simple_bending_equation.pdf
    • https://cdn.shopify.com/s/files/1/0430/5997/0202/files/95286492402.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0295/files/atmel_studio_6.pdf
    • https://cdn.shopify.com/s/files/1/0434/6288/5541/files/zofajobibado.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d11.bin
3463c3d0dc7fb940cf7f2767c1a7ef89f1f5af2c46a45ae7e3ebe26fc05b20ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D11 4732 bytes
font_01_sfnt_off00007d2c.bin
14a1410436385896a87349edcb591d008607e12fe6843a34b86dbc336f69e975		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D2C 10500 bytes
font_02_sfnt_off0000a0f0.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0F0 4324 bytes

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