Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be8b805b91c1373…

MALICIOUS

PDF

43.3 KB Created: 2020-09-11 21:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c2287ad978ec3475fbdc23240daf5a7 SHA-1: 9ad76b3801171901ac97df890188d870f9cd212b SHA-256: 7be8b805b91c1373db59fca5bf9797f48fa1864e113eda58961b6802404ed6c3
152 Risk Score

Malware Insights

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

The PDF file contains a link farm and a direct link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to presentation templates and the malicious URL. The ML classifier strongly indicated maliciousness. The primary attack vector appears to be social engineering via a deceptive link, leading to potentially harmful content.

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.club/wix?keyword=creative+ppt+presentation+templates+free
    • http://files.straightfromtheheartinc.org/uploads/1/3/1/3/131380292/6666583.pdf
    • http://levekom.pnexams.com/uploads/1/3/0/7/130776677/kaxenivifuvatuw.pdf
    • http://fegaw.maggieparke.com/uploads/1/3/1/3/131381489/89cb976d4.pdf
    • https://cdn.shopify.com/s/files/1/0430/9434/3841/files/86599204387.pdf
    • https://cdn.shopify.com/s/files/1/0431/9041/9620/files/rulapaxaraleditatoxazeta.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/select_cell_in_active_sheet_vba.pdf
    • https://cdn.shopify.com/s/files/1/0466/6454/8517/files/job_interview_preparation_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/8227/6257/files/95587575628.pdf
    • https://cdn.shopify.com/s/files/1/0428/9216/5279/files/68195844043.pdf
    • https://cdn.shopify.com/s/files/1/0435/8569/9997/files/die_epoche_der_aufklrung.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_b2ef6ec55c154b5887c2b39fbafa6f3f.pdf
    • https://static.usrfiles.com/ugd/b463f2_b43d90ec4a7e4596a7f58aa312e0a5b6.pdf
    • https://static.usrfiles.com/ugd/63d3ad_56aaf447844040ca8e46c68321977b47.pdf
    • https://static.usrfiles.com/ugd/3a38e0_c6ac2d80e544411b9342ce7002aee5d3.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_off00006d30.bin
81554d49344f2dac98c181cc9f102b5c05616ff7529b8e50ce11be52bfd82ec7
pdf-font-stream PDF embedded font (sfnt) at offset 0x6D30 5012 bytes
font_01_sfnt_off00007e2b.bin
82c2006b9998dc85f007ca1221ffd785a37cfd228b950712a2d61f045fa5b12c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E2B 10136 bytes