Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d5df9018508a47…

MALICIOUS

PDF

45.9 KB Created: 2020-10-15 09:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: d41c3409ba5ae5073f9e77d7505b2dca SHA-1: 9372b441fb726b6c97c33c79073aeb3046ec75e4 SHA-256: 72d5df9018508a4708bf82f01ac18e764bbaa9477084b664d4e8d78543fd5752
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links to external PDF files, a technique often used for SEO link farming and to obscure malicious redirects. One of the embedded links points to a known malicious redirector, which likely serves as the initial stage for a broader attack. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content or traffic.

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://cctraff.ru/strik?keyword=radioactive+decay+math+worksheet+answers In PDF document text
    • https://site-1039733.mozfiles.com/files/1039733/75547089016.pdfIn PDF document text
    • https://site-1043574.mozfiles.com/files/1043574/tafutubap.pdfIn PDF document text
    • https://site-1036820.mozfiles.com/files/1036820/tipezufilisu.pdfIn PDF document text
    • https://site-1036988.mozfiles.com/files/1036988/vuruxutok.pdfIn PDF document text
    • https://site-1037222.mozfiles.com/files/1037222/paxalunakujerabefugolaru.pdfIn PDF document text
    • https://fadusoga.weebly.com/uploads/1/3/0/7/130739873/c2e2df821.pdfIn PDF document text
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/tidivobinimigip-banez-batipafon.pdfIn PDF document text
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/wamix-nepoxek-besusaze.pdfIn PDF document text
    • https://mogilifus.weebly.com/uploads/1/3/0/7/130739831/4102594.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/filamovebitojiloxevo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f8700e0b1a12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5f8724087e310.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369334/normal_5f87b6db63e08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368732/normal_5f878d8e7f307.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365540/normal_5f8704922d41d.pdfIn PDF document text
    • https://site-1042892.mozfiles.com/files/1042892/rivavobugimikelajerabi.pdfIn PDF document text
    • https://site-1042969.mozfiles.com/files/1042969/jimupipavawugaje.pdfIn PDF document text
    • https://site-1040896.mozfiles.com/files/1040896/wavidojiperefor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3162/5882/files/www_bodyfitsuperstore_com_hcg_diet_injections.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6649/7960/files/87822952419.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/2430/9160/files/halo_exe_download_free.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0492/4234/1542/files/the_scarlet_ibis_summary_and_analysis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3972/6487/files/old_french_dictionary.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0213/7240/files/vera_wang_bedding_nordstrom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/5657/3863/files/xaxokerefosiwobogafir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5431/7214/files/42197958403.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2823/9768/files/tubivomevikumivuv.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000738c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x738C 5472 bytes
SHA-256: ac0cf5b9fe2a363aeea9d8dfcf21a92d68e811ce264dcca157c0bc0a8e3e3d9e
font_01_sfnt_off00008621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8621 10460 bytes
SHA-256: 46b3e1fac7d29e7048f5db2a7dae0b4a1a16d4499cecba2f33f3e49001095ba8