Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb2d498ab7f1a5b…

MALICIOUS

PDF

50.1 KB Created: 2020-08-30 13:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 106b79df3ac84dc2d35521155d11411f SHA-1: 7c08a6fb49ca19a735c6c8c25a9244c9ef0f89b2 SHA-256: 4eb2d498ab7f1a5be258d42c109e2455cb91ad038906e6ee91a00569fee88dae
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector at ttraff.com. This suggests a link farm or SEO poisoning tactic designed to funnel users to malicious content. No scripts were extracted from this sample.

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/wix?keyword=exercicios+resolvidos+de+curvas+hori
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/70144406983.pdf
    • https://cdn.shopify.com/s/files/1/0436/1306/1277/files/83395838298.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nemevisofopanufu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3939/0872/files/f_r_c_s_full_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/0071/6694/files/batugowatoni.pdf
    • https://cdn.shopify.com/s/files/1/0446/3493/1363/files/zipefov.pdf
    • https://static.usrfiles.com/ugd/b8c837_892d3fbbb69d41a09f1340ce68271130.pdf
    • https://static.usrfiles.com/ugd/238140_896fcb63258042d3a965e9acf7220852.pdf
    • https://static.usrfiles.com/ugd/12f4eb_b7dd40e5f68444e882679dd340fa59f1.pdf
    • https://static.usrfiles.com/ugd/e73fea_e0af04daab254b1ca368e92b72fbd80a.pdf
    • https://static.usrfiles.com/ugd/b8c837_6f53ec0b69594ddd80c7ee7099861fe4.pdf
    • https://static.usrfiles.com/ugd/9e53d4_58d64c5357ab48048117fac6e7c37886.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_off000073b0.bin
198f90536f530d4b0e5ef951516afadfd098bfdb8f5518f07c015346c5f11cb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B0 5112 bytes
font_01_sfnt_off0000850a.bin
0de20087c4fa1f54c1333069644a4ca9f5d329caca5c381b21bdbf1ef0c9f569		 pdf-font-stream PDF embedded font (sfnt) at offset 0x850A 18264 bytes

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