Malicious PDF — malware analysis report

Static analysis result for SHA-256 760fb8a9f0f9c9f0…

MALICIOUS

PDF

57.6 KB Created: 2020-08-19 03:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f6e839385dd2518a099418072142337 SHA-1: f59a5420465a1ed9ce5677d34f587583847161de SHA-256: 760fb8a9f0f9c9f09041639d3dbb8cce6a7daef8ae6e99a9a17881c8f37eb4b9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains multiple embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or redirection 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.ru/pify?keyword=paradesi+babu+odia+song
    • http://files.luskccmaths.com/uploads/1/3/1/8/131856543/456821.pdf
    • http://files.ttautothunderbay.com/uploads/1/3/2/7/132740214/fixitiwesa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5048/4390/files/nuxidavepe.pdf
    • https://cdn.shopify.com/s/files/1/0438/1350/3133/files/jaxuzuxisegi.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7362/files/zovotuwiwesaxokota.pdf
    • https://cdn.shopify.com/s/files/1/0434/8346/3832/files/5815692297.pdf
    • https://cdn.shopify.com/s/files/1/0433/0595/9574/files/4064852006.pdf
    • https://cdn.shopify.com/s/files/1/0430/2117/2897/files/xuwifilajuw.pdf
    • https://cdn.shopify.com/s/files/1/0428/5769/3347/files/florida_boaters_license_exam_answers.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7362/files/power_electronics_hart.pdf
    • https://cdn.shopify.com/s/files/1/0430/1458/6521/files/zelifu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8558/4797/files/digital_signal_processing_mitra_3rd_edition.pdf
    • https://cdn.shopify.com/s/files/1/0443/1344/4508/files/51879887822.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009b4f.bin
84528216e60fac193a773e3a0595b1ae0273a5a4918af0cf10853426405196ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x9B4F 5104 bytes
font_01_sfnt_off0000aca9.bin
52e1bff48154b1d3241891d4d4b55b1b7e84d93d7df889bd18b886f9008e3cab
pdf-font-stream PDF embedded font (sfnt) at offset 0xACA9 14556 bytes