Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b257fe267d32c60…

MALICIOUS

PDF

46.5 KB Created: 2020-09-02 09:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea677bef528c90cd1cbe032f4ed26a15 SHA-1: 1c63fca4bb82ddffdac8dae1599df5c4cf4890cd SHA-256: 1b257fe267d32c60d0997b7809031a37c3e4423e2547c5a3a90bedf65ba14732
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to a redirector URL associated with malicious activity. The document body, though heavily obfuscated, contains text related to 'Android phone battery not charging' and the malicious URL, suggesting a lure for phishing or a scam. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO for malicious content or to distribute further payloads.

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/wix?keyword=android+phone+battery+not+charging
    • https://cdn.shopify.com/s/files/1/0434/1864/8732/files/xajerunomefemuxi.pdf
    • https://cdn.shopify.com/s/files/1/0434/5787/2033/files/carbonation_chart.pdf
    • https://cdn.shopify.com/s/files/1/0465/5844/5718/files/android_21_good_dokkan.pdf
    • https://static.usrfiles.com/ugd/4d935e_df22bfa720a64e0a9efd88ed0f0cee67.pdf
    • https://static.usrfiles.com/ugd/345929_6faf2204334f4cacadcfb06cf82bcec2.pdf
    • https://static.usrfiles.com/ugd/bdeb4c_51b2dbe17fed40d7b00512d2e25f8800.pdf
    • https://static.usrfiles.com/ugd/b8c837_0386f3b8c84d4403ae92a649a43a33dc.pdf
    • https://static.usrfiles.com/ugd/9904c2_93ec2cbc90e34e21a8f058d77a46c932.pdf
    • https://cdn.shopify.com/s/files/1/0431/7010/3452/files/lubixokiritojuwiwefe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6980/8535/files/centrifugal_compressor_types.pdf
    • https://cdn.shopify.com/s/files/1/0447/3811/7781/files/ernesto_che_guevara_biography.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_off00007a14.bin
0a7a385e8bef3a15a897a9c9c34b56da2bb1e37bfb05feca8b4bd0924d0c839a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A14 5356 bytes
font_01_sfnt_off00008c48.bin
eb07362804b1be04963e599fe97a7633213af4b0f994f383389eb9ca74559c9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C48 9656 bytes