Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17dd1b5cc08ce0b…

MALICIOUS

PDF

34.4 KB Created: 2020-08-18 18:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e546f7c6f15628b8669fa04bec127afc SHA-1: c869d2ed5e2e0a0bf392f4bb78f94d3dced8a647 SHA-256: c17dd1b5cc08ce0b96c44bf7f871cab9558dd6549982748fba298b7258fbd24d
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large external PDF link farm, suggesting an attempt to manipulate search results or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of numerous links, including a malicious redirector, points to a content-driven 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.ru/pify?keyword=alpine+ilx-+w650+android+auto+review
    • http://rugibaf.waistgame.com/uploads/1/3/0/9/130968973/kosajodila.pdf
    • http://files.dandridgesafaris.com/uploads/1/3/1/4/131453996/e1ecd.pdf
    • http://files.yusuketakemura.com/uploads/1/3/1/8/131859993/2bdbd294e85043.pdf
    • http://files.geraldpoindexter.com/uploads/1/3/0/7/130776714/ede372113ebe732.pdf
    • https://cdn.shopify.com/s/files/1/0433/7447/7464/files/rowoxirofamibisudugikobe.pdf
    • https://cdn.shopify.com/s/files/1/0434/0085/5706/files/xibedazotuzemoxezeku.pdf
    • https://cdn.shopify.com/s/files/1/0434/9257/3336/files/4441518828.pdf
    • https://cdn.shopify.com/s/files/1/0436/9429/3142/files/wavopufatif.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/jezovezo.pdf
    • https://cdn.shopify.com/s/files/1/0428/3577/1558/files/nonedusadififewukonik.pdf
    • https://cdn.shopify.com/s/files/1/0438/6340/8795/files/fisupafugurawefusoxe.pdf
    • https://cdn.shopify.com/s/files/1/0437/6893/8658/files/54235038751.pdf
    • https://cdn.shopify.com/s/files/1/0431/7049/6672/files/kagimaxevonidegopa.pdf
    • https://cdn.shopify.com/s/files/1/0437/8843/5613/files/articles_on_national_action_plan.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5085/files/structural_building_components.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6566/files/rv_jackknife_sofa_sheets.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_off00004757.bin
4612140d2d9ff63d1783f82656af4ba151e82853f0921c20c6e500fd8b415fbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x4757 5436 bytes
font_01_sfnt_off00005a01.bin
20b9282bec3f54795a3a4073e1cc77844e305c6116d3dc21eb1b342cab59b4d3
pdf-font-stream PDF embedded font (sfnt) at offset 0x5A01 10232 bytes