Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c62c3ab3f5298e8…

MALICIOUS

PDF

42.4 KB Created: 2020-08-10 16:38:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15c25e3f9ca60e2087b19e6fe91ca08b SHA-1: 2362a0012f94e4f4a69959f6b84a98a05943fda5 SHA-256: 7c62c3ab3f5298e877b4f2d57c752044fcfa7def05deda576442e22019e4189a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=solamente+una+vez+agustin+lara+pdf`. Additionally, the PDF exhibits characteristics of a link farm, embedding numerous external PDF links, many of which are hosted on potentially compromised or malicious domains. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=solamente+una+vez+agustin+lara+pdf
    • http://files.streetambitionunited.com/uploads/1/3/1/8/131856212/zimazutav.pdf
    • http://files.mrsheridanenglish.com/uploads/1/3/2/6/132695566/paropamosed.pdf
    • http://files.seminolesportsacademy.com/uploads/1/3/1/3/131383838/7623388.pdf
    • http://bajaf.razortattoos.com/uploads/1/3/0/7/130739561/e5452914e3c0902.pdf
    • http://files.ochsbass.com/uploads/1/3/2/7/132710575/9066850.pdf
    • https://cdn.shopify.com/s/files/1/0430/0665/6666/files/61164718368.pdf
    • https://cdn.shopify.com/s/files/1/0448/5431/3122/files/animal_classification_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0450/3171/9070/files/bazewodaregivaz.pdf
    • https://cdn.shopify.com/s/files/1/0435/0076/5336/files/bridal_chorus_chords.pdf
    • https://cdn.shopify.com/s/files/1/0432/7515/7670/files/jepigajizolesipamojatope.pdf
    • https://cdn.shopify.com/s/files/1/0428/1221/1359/files/26876156417.pdf
    • https://cdn.shopify.com/s/files/1/0428/8544/7833/files/43823051428.pdf
    • https://cdn.shopify.com/s/files/1/0431/3192/8740/files/16922651642.pdf
    • https://cdn.shopify.com/s/files/1/0437/9344/9122/files/gusonilovefaxomik.pdf
    • https://cdn.shopify.com/s/files/1/0438/5023/6064/files/158428045.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_off00006568.bin
c8710786bfc2c355fa11ccf3cc87e70116575ffa2d9738c1db69701cd5a78fc3
pdf-font-stream PDF embedded font (sfnt) at offset 0x6568 5572 bytes
font_01_sfnt_off00007856.bin
012650f5551ae029a843e816df6371dae06a2e88354c324e629e213d82ebf7e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7856 11116 bytes