Malicious PDF — malware analysis report

Static analysis result for SHA-256 241a312db77fbe27…

MALICIOUS

PDF

40.0 KB Created: 2020-08-20 22:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6807a4c5da7acb9c315fde21b414672 SHA-1: cc0c5f63568bbfe3318c6957edc23ed47ff60dd6 SHA-256: 241a312db77fbe277ad9eb36161c519e854b2849f09f9d88b3c02bb0e0bf8b9d
152 Risk Score

Malware Insights

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

This PDF document contains a link farm and a direct link to a known malicious redirector. The document body text, though corrupted, includes the search query 'beetalk myanmar apk free' and the malicious URL, suggesting a lure to download potentially unwanted software or malware. The ML classifier strongly indicated maliciousness, and the PDF structure itself points to a link farm designed for SEO manipulation, likely to obscure the malicious redirector.

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.com/pify?keyword=beetalk+myanmar+apk+free
    • http://files.bergthalmennonitechurch.com/uploads/1/3/2/6/132681783/fefc2e.pdf
    • http://files.themcbdd.com/uploads/1/3/0/8/130814397/vomawegaxovibedunejo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1550/4029/files/35894384698.pdf
    • https://cdn.shopify.com/s/files/1/0433/6500/7509/files/sobitanowaxu.pdf
    • https://cdn.shopify.com/s/files/1/0431/1236/6241/files/givowemawawulobatanu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9321/2827/files/62328434468.pdf
    • https://cdn.shopify.com/s/files/1/0430/9693/2501/files/dynamics_365_licensing_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/0458/3318/files/52765107704.pdf
    • https://cdn.shopify.com/s/files/1/0428/9118/2243/files/rigovitofe.pdf
    • https://cdn.shopify.com/s/files/1/0437/6153/3082/files/dmv_bill_of_sale_california.pdf
    • https://cdn.shopify.com/s/files/1/0428/8089/3084/files/aloisia_horse_form.pdf
    • https://cdn.shopify.com/s/files/1/0440/5588/8022/files/lithography_semiconductor.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000452e.bin
7fe896c6303fc2ad675b3776630576f291afa83053b87bc78beb9f4631e531a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x452E 5084 bytes
font_01_sfnt_off0000566e.bin
aaf5789b571ac09bd5add2e7d1ec135807320f53350c6118c98d791c5a8b84aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x566E 9724 bytes
font_02_sfnt_off000077dc.bin
6e875aff034b77f7ce255d10f37a08af8a22a9cad52bbbd1da14d86c9b96be0f
pdf-font-stream PDF embedded font (sfnt) at offset 0x77DC 9136 bytes