Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed986d751f2b15e5…

MALICIOUS

PDF

46.6 KB Created: 2020-08-24 14:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 135d9b75fed291a1c9499fdcb761edef SHA-1: 1d5c564161b5a7f310e9528316623d1f52a45679 SHA-256: ed986d751f2b15e533403d4f556172f7b626d3f2f553d2fa8903b0a69d0613cd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and URLs, suggesting it is not intended for human consumption but rather for SEO manipulation or as a lure to malicious content. The primary malicious IOC is the redirector URL.

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://ttraff.ru/pify?keyword=splash+screen+animation+android+studio
    • http://files.gstpchurch.org/uploads/1/3/0/7/130740138/kafudunevipobaw-junodikudutizi.pdf
    • http://files.agsandproducts.com/uploads/1/3/1/4/131452733/6166563.pdf
    • http://files.nanoluge.com/uploads/1/3/1/4/131437246/lizedinivexigo_nazawivitagipu_zekaga.pdf
    • http://files.theputneypolestudio.com/uploads/1/3/1/6/131636719/9240263.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20880330559.pdf
    • https://cdn.shopify.com/s/files/1/0430/5272/8474/files/lumidokozej.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/washington_manual_of_surgery_7th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0434/4548/5725/files/85254384570.pdf
    • https://cdn.shopify.com/s/files/1/0428/0382/2755/files/nedowux.pdf
    • https://cdn.shopify.com/s/files/1/0436/5837/9417/files/shin_chan_psp_game.pdf
    • https://cdn.shopify.com/s/files/1/0439/3736/6174/files/66060644081.pdf
    • https://cdn.shopify.com/s/files/1/0429/0537/0791/files/acid_base_equilibrium_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/8860/1503/files/captain_tsubasa_4_pc_game_2015.pdf
    • https://cdn.shopify.com/s/files/1/0432/4379/8683/files/employee_salary_sheet_in_excel.pdf
    • https://cdn.shopify.com/s/files/1/0428/7866/4867/files/40717270225.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006a5d.bin
36e4beaa2f361f1471c475aff6bdd2eb84cc66ee566777a553499e5d2318cb62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A5D 5300 bytes
font_01_sfnt_off00007c1c.bin
4dc2ff556e3408ba8c9f13a12e0e2024b5676c498f5279f75c167af1987f35e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C1C 10284 bytes
font_02_sfnt_off00009f63.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F63 4324 bytes

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