Malicious PDF — malware analysis report

Static analysis result for SHA-256 833dee4b58a3ed68…

MALICIOUS

PDF

33.8 KB Created: 2020-09-03 01:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d704a307e5ac280c1aa215ba7517ab5b SHA-1: 4a6ea323ed33d7af9b7a9f029afbd17e984cb352 SHA-256: 833dee4b58a3ed68a94c8ad025b109c042912db826bb99f8a06a91b50614832f
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with one prominent link identified as a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'lignospan safety data sheet' and the malicious URL. This suggests the document is designed to trick users into clicking the link under the guise of accessing important information, leading them to malicious infrastructure.

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.link/wix?keyword=lignospan+safety+data+sheet
    • https://static.usrfiles.com/ugd/0dcf4b_4939d3fe85b44b8cb9767cce99b6342a.pdf
    • https://static.usrfiles.com/ugd/7a359d_f8eacb0684b849c8b56d5cc1b1ab94eb.pdf
    • https://static.usrfiles.com/ugd/88a84f_19e79e68245b42059b6245000cbca186.pdf
    • https://static.usrfiles.com/ugd/a44510_34e1edd8bd11453d9e2deed04d1434bf.pdf
    • https://static.usrfiles.com/ugd/1d64af_8f3e37cefbc24fa2bee615fc8d011067.pdf
    • https://cdn.shopify.com/s/files/1/0431/5106/5243/files/breakdown_maintenance.pdf
    • https://cdn.shopify.com/s/files/1/0436/7358/3781/files/palutowelevufibipe.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3904/files/fefifenizavifotitobolozew.pdf
    • https://cdn.shopify.com/s/files/1/0428/5857/8086/files/adobe_trial_expired_reset.pdf
    • https://cdn.shopify.com/s/files/1/0434/7445/2632/files/71079680883.pdf
    • https://cdn.shopify.com/s/files/1/0430/2074/6906/files/refugapuduvafejonowar.pdf
    • https://static.usrfiles.com/ugd/b8c837_114f64670ca74bfea1e12801b3e01b00.pdf
    • https://static.usrfiles.com/ugd/b30cf0_dfced267158e440d9b4cd44bab1a38eb.pdf
    • https://static.usrfiles.com/ugd/6203b9_e52686768c184b698171446ab0ed9d9c.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_off00004640.bin
40b0d007a37e2d9460fd8dec7ca3f288de1076ca1393b0c26dacba6f037975e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x4640 5220 bytes
font_01_sfnt_off00005819.bin
9c743a1d352d6967240a6251e4a0d7a84db9d185b1d40ff2589d9a9c0b7e45fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x5819 10096 bytes