Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7becee4616eba7a…

MALICIOUS

PDF

44.1 KB Created: 2020-09-05 08:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23ed7da6dbe8677c2bcc21a20db70c7b SHA-1: 8db54eea7ea7115ca48588c6e04e324dc290fb95 SHA-256: f7becee4616eba7a8a86bb49074d770ab1ad1ebe10692ca542bbb448beaa6f0e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'graph exponential functions worksheet' and the malicious redirector URL. This suggests the document is part of an SEO link farm or a phishing campaign designed to lure users to potentially harmful sites.

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/pify?keyword=graph+exponential+functions+worksheet
    • https://cdn.shopify.com/s/files/1/0434/5869/1232/files/38132895403.pdf
    • https://cdn.shopify.com/s/files/1/0433/7231/4778/files/cb_background_hd_zip_file_2019.pdf
    • https://cdn.shopify.com/s/files/1/0433/8191/5798/files/13612212400.pdf
    • https://cdn.shopify.com/s/files/1/0433/9980/7126/files/muzexux.pdf
    • https://cdn.shopify.com/s/files/1/0435/7170/8065/files/metabolisme_asam_amino.pdf
    • https://static.usrfiles.com/ugd/9ec29b_fc92b6ef600a48f0af13181debb9633e.pdf
    • https://cdn.shopify.com/s/files/1/0433/8191/5802/files/48165757330.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/36289730978.pdf
    • https://cdn.shopify.com/s/files/1/0437/3934/9146/files/isn_t_it_lovely_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59022585862.pdf
    • https://cdn.shopify.com/s/files/1/0432/9524/4441/files/automotive_service_technician_job_description_template.pdf
    • https://cdn.shopify.com/s/files/1/0440/7725/2760/files/irs_nmero_para_hablar_a_una_persona.pdf
    • https://cdn.shopify.com/s/files/1/0431/9064/8996/files/41423103831.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_off00005934.bin
308bdcb23a307bf030cacc23d0d8d238582be9b08cbfde5f692301c458df8217
pdf-font-stream PDF embedded font (sfnt) at offset 0x5934 5356 bytes
font_01_sfnt_off00006b85.bin
f93cf10dcefddd39505906d51238a7450993451d7b947efed11f84c91651fb47
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B85 10228 bytes
font_02_sfnt_off00008e94.bin
713933360072c9d59346590fad668f98c3603c6d2b72ed941ce85481f6af0b74
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E94 16060 bytes