Malicious PDF — malware analysis report

Static analysis result for SHA-256 8147d8c909a71a16…

MALICIOUS

PDF

43.4 KB Created: 2020-08-24 20:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d84f47a1d55558b62fc70fb1df83adf SHA-1: 7dc6b0ce0d1d5c01a2b9c35b06823c988f796fb0 SHA-256: 8147d8c909a71a16fd1e84f7f37ff51dd3adf51d4b2fe52656dda4d1dc443127
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a malicious redirector link disguised as a wallpaper download, indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic and the embedded URL. The ML classifier also strongly flagged this PDF as malicious. The document body and embedded URLs suggest an attempt to drive traffic to potentially malicious or spam-related content, likely for SEO manipulation or phishing.

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=bugatti+chiron+wallpaper+hd+for+android
    • http://files.frc5113.com/uploads/1/3/1/0/131070379/jixovaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0460/2514/6527/files/types_of_reliability_tests.pdf
    • https://cdn.shopify.com/s/files/1/0435/5493/0839/files/jotasisisopaz.pdf
    • https://cdn.shopify.com/s/files/1/0437/4783/6058/files/85583469190.pdf
    • https://cdn.shopify.com/s/files/1/0433/4921/3349/files/assam_tet_exam_centre.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26433336276.pdf
    • https://cdn.shopify.com/s/files/1/0427/8734/0454/files/8681278784.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99914628395.pdf
    • https://cdn.shopify.com/s/files/1/0447/5430/5175/files/cisco_catalyst_9300_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0454/8087/0040/files/anonymous_wallpaper_android.pdf
    • https://cdn.shopify.com/s/files/1/0437/0835/0619/files/cfr_21_part_11_download.pdf
    • https://cdn.shopify.com/s/files/1/0459/9100/2279/files/63079009359.pdf
    • https://cdn.shopify.com/s/files/1/0433/7834/4097/files/57449982300.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aa9.bin
e748b89578f5d906886ad2ac4d47005b8311a76b462f694038bb0581041308d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA9 5380 bytes
font_01_sfnt_off00007d01.bin
1e139dbb5d5a15d085f8b1f165f0378e7cb565b032d210069ae794673e60e281
pdf-font-stream PDF embedded font (sfnt) at offset 0x7D01 10524 bytes