Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f794066a695dc52…

MALICIOUS

PDF

55.5 KB Created: 2020-08-05 07:28:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d25c1a21351e8d252a3894b7a466a6e7 SHA-1: 641e9bf3d5e2f6689cbd53dfe9dc993512171cb9 SHA-256: 7f794066a695dc523b1de86f4f617bd77f369540be9e50891f79ca3165fb9244
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it's a redirector link to known malicious infrastructure. It also exhibits characteristics of an SEO link farm, embedding a large number of external PDF links, many of which point to Shopify domains. The document body, though partially corrupted, includes the URL that triggered the malicious redirector heuristic, suggesting a lure to a malicious site disguised as a design catalogue.

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=wedding+blouse+designs+catalogue+2020+pdf
    • http://files.finehusky.com/uploads/1/3/0/8/130813521/3099749.pdf
    • http://files.heavensgardenrestored.com/uploads/1/3/0/9/130969129/7444924.pdf
    • http://files.natureexperiencetours.com/uploads/1/3/1/4/131406736/kusuzinivimemapa.pdf
    • http://files.myinnatehealth.co.za/uploads/1/3/1/3/131378791/bd4d3.pdf
    • https://cdn.shopify.com/s/files/1/0434/0383/7592/files/6526967850.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/70355900834.pdf
    • https://cdn.shopify.com/s/files/1/0432/5828/2152/files/embed_google_drive.pdf
    • https://cdn.shopify.com/s/files/1/0429/4773/9811/files/99958465920.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0300/files/jubogugivisutupobenowevi.pdf
    • https://cdn.shopify.com/s/files/1/0438/2952/6690/files/beast_wars_episodes.pdf
    • https://cdn.shopify.com/s/files/1/0432/6440/9764/files/kixurovawixuxati.pdf
    • https://cdn.shopify.com/s/files/1/0434/0894/9402/files/country_code_316.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tagesagebog.pdf
    • https://cdn.shopify.com/s/files/1/0432/5287/5432/files/fazer_assinatura_digital_no.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/23509485571.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006384.bin
2b666c6f693cb0bde8c9fd550273a98e31dcac8b48b1e91f9a80aefff28344ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6384 9444 bytes
font_01_sfnt_off0000828f.bin
db13e180bbe37e722bbc027e606f4427b3524ad5bb3e66baf6cc93c7b437e391		 pdf-font-stream PDF embedded font (sfnt) at offset 0x828F 5652 bytes
font_02_sfnt_off000095f4.bin
4fa27c14f7cc1d9155754603916e117d224354675f3b55ddab3c0cd5041d872e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95F4 10772 bytes
font_03_sfnt_off0000ba55.bin
028dbaa76d48ae99b02248bacea50134e27ed131f5dd39e25ac401de8961e19b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA55 16312 bytes

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