Malicious PDF — malware analysis report

Static analysis result for SHA-256 da055f40ca02dacd…

MALICIOUS

PDF

44.1 KB Created: 2020-08-31 10:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 204385a17e9397c4323303efab0791ab SHA-1: b9e11c24ce3b9b007d9b183f9d20a3c3bd3e51ea SHA-256: da055f40ca02dacd18fc04136be89769a4d1113c1d9980dbfc453be8cc985293
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The primary malicious URL, https://ttraff.cc/wix?keyword=mama%2527s+guide+recipe+chicken, is identified as a known malicious redirector. The document body, though heavily obfuscated, contains this URL and numerous other links hosted on cdn.shopify.com, forming a link farm. This suggests the PDF's purpose is to lure users through these links to potentially malicious sites.

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/wix?keyword=mama%2527s+guide+recipe+chicken
    • https://cdn.shopify.com/s/files/1/0436/5733/0853/files/noledetisixotikigek.pdf
    • https://cdn.shopify.com/s/files/1/0461/7905/7817/files/organigrama_atizapan_de_zaragoza.pdf
    • https://cdn.shopify.com/s/files/1/0434/6380/3040/files/33632451416.pdf
    • https://cdn.shopify.com/s/files/1/0434/5351/3880/files/cds_syllabus_for_ota.pdf
    • https://cdn.shopify.com/s/files/1/0430/8199/0295/files/30621913952.pdf
    • https://cdn.shopify.com/s/files/1/0437/6743/1320/files/kivajepe.pdf
    • https://cdn.shopify.com/s/files/1/0438/1035/7405/files/antigona_hrvatski.pdf
    • https://cdn.shopify.com/s/files/1/0433/8316/0983/files/brs_biochemistry_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/81638265983.pdf
    • https://static.usrfiles.com/ugd/ca32a8_18068ec536fd4ebe9e9eecd183b43b53.pdf
    • https://static.usrfiles.com/ugd/fdee49_5c05d2434e6144a0805ff2a71738df4a.pdf
    • https://static.usrfiles.com/ugd/b8c837_4346a07626364f4ea31edb267f41de55.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_off000060cd.bin
479d6e7e2d8f1126cede76c78eef3560af4131b568c1106d050c45494a0bfb14
pdf-font-stream PDF embedded font (sfnt) at offset 0x60CD 3740 bytes
font_01_sfnt_off00006e21.bin
1c638a60d701a78ef3edefec51ec5795e26c1b0b0a40851509a3a1d2ae9d7541
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E21 5556 bytes
font_02_sfnt_off000080f0.bin
9114f7b2b7455203b6491c079d9830d078e3c8b7ae6f0f83095825ac0b950405
pdf-font-stream PDF embedded font (sfnt) at offset 0x80F0 10060 bytes