Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43f5aaf26123734…

MALICIOUS

PDF

43.7 KB Created: 2020-08-21 13:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb8d9244d0503fc38652dfbf827dc431 SHA-1: d24b0f6a2f7d055956c0e3c6a121daa48723743a SHA-256: e43f5aaf2612373471fc358ddd4d2a5568df416479fda3381544320f4f26eb4b
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with one identified as a malicious redirector. The ML classifier strongly indicated maliciousness. The presence of a malicious redirector suggests an attempt to direct users to harmful content or phishing sites. The document body, though heavily obfuscated, contains the malicious URL.

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=jungling+guide+season+9
    • http://files.cvpeyamaha.com/uploads/1/3/0/7/130740563/bemorosafavi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5012/3943/files/allan_pease_beden_dili.pdf
    • https://cdn.shopify.com/s/files/1/0436/0096/9890/files/aggiornamento_android_per_lg_g7.pdf
    • https://cdn.shopify.com/s/files/1/0433/4295/4651/files/86935178502.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/40914717568.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2680/files/20992907404.pdf
    • https://cdn.shopify.com/s/files/1/0431/8006/4936/files/jeffrey_craig_labeouf.pdf
    • https://cdn.shopify.com/s/files/1/0436/2698/7680/files/70209103748.pdf
    • https://cdn.shopify.com/s/files/1/0429/0114/3715/files/mijikonozebalifusitorov.pdf
    • https://cdn.shopify.com/s/files/1/0428/4992/7327/files/jasinu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/69278721662.pdf
    • https://cdn.shopify.com/s/files/1/0429/7857/4490/files/gikutagepapifatusodovewi.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_off00006fb6.bin
d49a742d87b6b3a4a8bcd5441e279674d1fbd265e6ea29473fc1ceedc023b43a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB6 5044 bytes
font_01_sfnt_off000080df.bin
24e0e080f1152b05dc2b7b0cebe4a4b5c1841e0a1d47bdc0b26cf68be36fcbff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80DF 9776 bytes

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