Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6941edd2644e77d…

MALICIOUS

PDF

42.7 KB Created: 2020-08-31 13:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e27ad84538ab1c43c322877664fb82f6 SHA-1: 1bce163cba73a5bb5e826bcf64be449c1a5946cf SHA-256: e6941edd2644e77d2ecd1a8feddade0543652088ff2511dac2d8675a92f163a7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a specific malicious redirector URL, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains text related to 'Google chrome for android jelly bean' and the malicious URL, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL, which likely leads to a further stage of the attack.

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=google+chrome+for+android+jelly+bean
    • https://cdn.shopify.com/s/files/1/0427/3173/3159/files/xapugusubub.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lonub.pdf
    • https://cdn.shopify.com/s/files/1/0429/8289/9871/files/93883019983.pdf
    • https://cdn.shopify.com/s/files/1/0437/6107/4337/files/android_app_store_developer_login.pdf
    • https://cdn.shopify.com/s/files/1/0429/6717/1223/files/633951081.pdf
    • https://static.usrfiles.com/ugd/8b4172_01e8e6db72994740a6fde0552638d1a2.pdf
    • https://static.usrfiles.com/ugd/7c30af_de9e283b848d48e4aa1d3846f5eab8a0.pdf
    • https://static.usrfiles.com/ugd/b8c837_8721ec39ed8242659ef8b3856c7e077f.pdf
    • https://static.usrfiles.com/ugd/b8c837_9624d14830c74476a1917027b3de8b7f.pdf
    • https://static.usrfiles.com/ugd/b58d21_019d0d1a7d744ebe9bb494513b3059ed.pdf
    • https://static.usrfiles.com/ugd/b0cd75_8990972871304ae4a71f937c53ebd60f.pdf
    • https://static.usrfiles.com/ugd/136d07_ba71f8a010734f9fab33a3a3cd7544e9.pdf
    • https://static.usrfiles.com/ugd/b6edda_e416a4934fca4fa78c6bcab071ee3a5f.pdf
    • https://static.usrfiles.com/ugd/b50c55_7b74a4a33b334f85b19df6fc486bc99b.pdf
    • https://static.usrfiles.com/ugd/7ff653_5dc53d8c4ec047c0b88c3f4596d7caa2.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_off00006783.bin
cc08aadf5c00f6a71b3e05e0e367f1241248d9d699bba8d927babab02308496f
pdf-font-stream PDF embedded font (sfnt) at offset 0x6783 5608 bytes
font_01_sfnt_off00007a7a.bin
4b2d4b4660f0a92ec345ba9b9941e8c0e00060845bce8ea716898f939c65085c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A7A 10200 bytes