Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b72a2549382d2fe…

MALICIOUS

PDF

35.0 KB Created: 2020-09-20 10:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f38d96eecd0916dd158d3868e929cb9 SHA-1: 39ee8f939fea6bdd1ae682d2c26a00faab45fe76 SHA-256: 9b72a2549382d2fed064ab7e3c00d4720347631d99160fef05a6935fed772469
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body also contains this URL, suggesting a social engineering lure. Additionally, the PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, many pointing to Shopify, which is often used to host benign files but in this context likely serves to obscure the malicious redirector. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this PDF.

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.club/wix?keyword=take+it+to+your+seat+math+centers+pdf
    • https://cdn.shopify.com/s/files/1/0427/4218/6150/files/shake_event_rpgmaker_mv.pdf
    • https://cdn.shopify.com/s/files/1/0459/7209/5136/files/27624034608.pdf
    • https://cdn.shopify.com/s/files/1/0429/1146/5638/files/zonologinive.pdf
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/98704251567.pdf
    • https://cdn.shopify.com/s/files/1/0433/3630/2750/files/94354360379.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3488/files/sopifisut.pdf
    • https://cdn.shopify.com/s/files/1/0435/5201/4491/files/vmware_workstation_pro_license.pdf
    • https://cdn.shopify.com/s/files/1/0432/5759/4011/files/react_bootstrap_form_control_set_value.pdf
    • https://cdn.shopify.com/s/files/1/0437/8856/6677/files/physics_giambattista.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53975554289.pdf
    • https://cdn.shopify.com/s/files/1/0483/3355/3817/files/atlas_copco_elektronikon_mk3_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/0372/3428/files/app_bancoposta_apk.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_off0000486a.bin
4c5a35f250804d5f701e951f81f074ec8e1ba19c5873727d6282f25414123fa4
pdf-font-stream PDF embedded font (sfnt) at offset 0x486A 5476 bytes
font_01_sfnt_off00005aee.bin
7262d13ea5c94968210f80c5e8ee267ba275f503cea75fdc00d9c5afc01f286f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AEE 10280 bytes