Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a852f785a185ab…

MALICIOUS

PDF

50.7 KB Created: 2020-08-20 23:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32c6535879b41c68f48fcab4773132fb SHA-1: c599fbbbea512c5c567806b3ffd7068463221eb5 SHA-256: 44a852f785a185ababd47cccdd68119f45902e7a7c165d51dcfd609d2e1614f1
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a mass external link farm, with one URL pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of this link farm. The ML classifier strongly indicated maliciousness. The primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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.com/pify?keyword=bodyguard+movie+songs++telugu
    • http://mujunifup.mikeysgunshop.com/uploads/1/3/0/9/130969685/4662654.pdf
    • http://files.sathiavanee-veeramoothoo.com/uploads/1/3/1/8/131871891/jidutemepupaz.pdf
    • http://pagut.edygies.com/uploads/1/3/1/3/131379179/jojesuwozewef.pdf
    • https://cdn.shopify.com/s/files/1/0427/5693/1751/files/hypertension_canada_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0437/0454/9544/files/happy_birthday_cake_photos_com.pdf
    • https://cdn.shopify.com/s/files/1/0454/8486/7736/files/excel_free_timeline_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/2072/2080/files/xamikovotewodupepulusi.pdf
    • https://cdn.shopify.com/s/files/1/0433/2060/6885/files/lexidumifinufewisosexe.pdf
    • https://cdn.shopify.com/s/files/1/0427/6515/6508/files/88487174280.pdf
    • https://cdn.shopify.com/s/files/1/0435/7976/8995/files/wiparofotozi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9430/2115/files/surah_al_kahfi_penuh.pdf
    • https://cdn.shopify.com/s/files/1/0438/9106/4987/files/audition_next_level_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/7054/6329/files/descriptive_research_design_quantitative.pdf
    • https://cdn.shopify.com/s/files/1/0431/2272/0922/files/84783745629.pdf
    • https://cdn.shopify.com/s/files/1/0428/9065/7951/files/24634356289.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/examples_for_job_interview_questions_and_answers.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000810a.bin
37a54b660e78b758a7b3ac8f29dcb705995e8130f1a45290cbca987b0ae69c67
pdf-font-stream PDF embedded font (sfnt) at offset 0x810A 5356 bytes
font_01_sfnt_off0000933a.bin
822daf020bb1ceae1e628cc7ba17286abf1495dfbc15338071439feb41738937
pdf-font-stream PDF embedded font (sfnt) at offset 0x933A 13412 bytes