Malicious PDF — malware analysis report

Static analysis result for SHA-256 8338997ecfe6c9e9…

MALICIOUS

PDF

47.5 KB Created: 2020-08-06 15:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08f8472f98acc50a46aa43fec3194d0b SHA-1: b96ee01c7a03ff414208f6040878b67a28a67c4a SHA-256: 8338997ecfe6c9e936d22e17a8bb397f9b6f64378f1050a3aea51e54db2fa076
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with the primary link identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, indicating the document's purpose is to lead users to harmful sites. The ML classifier also strongly flagged this PDF as malicious. 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.ru/wb?keyword=intelligence%20structure%20test%20pdf%20free%20download
    • http://files.rachelmariephotography.net/uploads/1/3/1/4/131438069/844036.pdf
    • http://files.alpsed.online/uploads/1/3/0/8/130813427/4288840.pdf
    • http://files.militzasiberians.com/uploads/1/3/2/7/132740836/aefdb.pdf
    • http://files.waiheelimu.org/uploads/1/3/1/6/131607174/nomuvawezilamaranu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/83797831564.pdf
    • https://cdn.shopify.com/s/files/1/0440/9350/5688/files/64127020616.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4049/files/bobcat_service_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/ganuvavupebuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/6832/5029/files/1874317939.pdf
    • https://cdn.shopify.com/s/files/1/0436/9612/8153/files/suzonasadaveveze.pdf
    • https://cdn.shopify.com/s/files/1/0430/0016/8597/files/91199815766.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/luvifatetiruwugowana.pdf
    • https://cdn.shopify.com/s/files/1/0428/5153/2963/files/zivitudimagipetu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/55847968238.pdf
    • https://cdn.shopify.com/s/files/1/0433/1195/6126/files/jenokidusirawosugepedev.pdf
    • https://cdn.shopify.com/s/files/1/0439/9484/1246/files/50276475942.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bodadajigewodozisidezufe.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_off000063cf.bin
37d5d9d663d4a2122e1984a88a44456f1975c7b3dc7a7538204121526871162c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63CF 5352 bytes
font_01_sfnt_off0000762b.bin
089b9d0c7113d618e86123b2cf184b106e9e2d34b7e99752ac4c4101111c47b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x762B 10376 bytes
font_02_sfnt_off000099bd.bin
8c772610a8dd344f75c492c86de39e53278ca49f6778f20fd9a3e415d8f2216b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99BD 16132 bytes

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