Malicious PDF — malware analysis report

Static analysis result for SHA-256 41cad2a3466ad5e7…

MALICIOUS

PDF

42.5 KB Created: 2020-08-10 00:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d82de1631b3da072920ad105c3f08a34 SHA-1: 060f65769f987803baf3593c5d2adec15458c55a SHA-256: 41cad2a3466ad5e7ab8a3d098c5d9a1f2e869d5aa0133c8a837a6b02a05c740c
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'woodworking bench plans free pdf' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirector attack pattern.

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.cc/pify?keyword=woodworking+bench+plans+free+pdf
    • http://files.victorychapel.net/uploads/1/3/1/3/131379759/bibewomo-fojitorerilur-nenasalaxalesel-sojuzaxisoseve.pdf
    • http://files.first367.fi/uploads/1/3/0/8/130814535/6853228.pdf
    • http://files.zambiasafarihunting.com/uploads/1/3/1/3/131379820/wutogibabuxapopewaki.pdf
    • https://cdn.shopify.com/s/files/1/0429/3948/2275/files/managing_and_troubleshooting_pcs_fifth_edition.pdf
    • https://cdn.shopify.com/s/files/1/0440/0198/4662/files/dunafanojawumofulasug.pdf
    • https://cdn.shopify.com/s/files/1/0427/7954/1671/files/30459025870.pdf
    • https://cdn.shopify.com/s/files/1/0433/4498/6280/files/72170736178.pdf
    • https://cdn.shopify.com/s/files/1/0431/6394/3067/files/7339456985.pdf
    • https://cdn.shopify.com/s/files/1/0434/6108/3288/files/watesaku.pdf
    • https://cdn.shopify.com/s/files/1/0432/6624/4766/files/73006010319.pdf
    • https://cdn.shopify.com/s/files/1/0439/1573/9304/files/jurnal_aspergillus_flavus.pdf
    • https://cdn.shopify.com/s/files/1/0434/7982/6582/files/clementine_von_radics_mouthful_of_forevers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vololo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8938/7935/files/bohr_magneton.pdf
    • https://cdn.shopify.com/s/files/1/0428/9229/6358/files/femidifivadufagimub.pdf
    • https://cdn.shopify.com/s/files/1/0428/1516/0487/files/ashokan_farewell_violin.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_off0000676d.bin
a485f26f45db61f882c386b16363a2ad8760179b91f0d65b85fc2cab9e4c9a7c
pdf-font-stream PDF embedded font (sfnt) at offset 0x676D 5724 bytes
font_01_sfnt_off00007afe.bin
a23640de2ea04116bfe43917ab67736be45fbd9f1bb64d9fa2321761b368e016
pdf-font-stream PDF embedded font (sfnt) at offset 0x7AFE 9964 bytes