Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f38d94450c9d776…

MALICIOUS

PDF

44.4 KB Created: 2020-10-28 00:49:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8eb918cf77de9448fa61a00a3d49c1b9 SHA-1: 83cea011214e7fb3113c10f75bf1c4941bfd36d6 SHA-256: 8f38d94450c9d776328ec203cecee681f5a4d4c814b0957f9c1e8d3d5d524b01
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs hosted on external sites, suggesting a link farm or redirection scheme.

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://gettraff.ru/123?keyword=raiser%2527s+edge+nxt In PDF document text
    • https://pixabetamomu.weebly.com/uploads/1/3/1/0/131070001/7468029.pdfIn PDF document text
    • https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/manesunona_pulad_mupuzexe.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/29515c17a0.pdfIn PDF document text
    • https://dunofedipusafo.weebly.com/uploads/1/3/4/4/134477286/zapirugufalufit.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/pazuruvegawige-nutakopufe-dawive-nopenosawabo.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/a7405e2b5148652.pdfIn PDF document text
    • https://vekaluledezo.weebly.com/uploads/1/3/4/2/134235689/pokip.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b6e652b-5e24-494a-8068-bf492a66526b/jiwuzewoxenulevuwubifawuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6382e0d9-3d47-4a22-9fc1-92ff1a8f49eb/melugogosokolezun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c8a14d1-c45c-4fa4-b0dd-de04c040fe2f/92890283265.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3279a2ce-a611-4e8c-a9ef-b355ddbd86c6/9108395083.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/5043/4211/files/65149239962.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/8311/1831/files/73678879609.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0505/5171/8070/files/android_chrome_browser_text_to_speech.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6035/3429/files/evil_eye_plus_apk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0503/0064/9637/files/7150786463.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1344/7577/files/load_order_skyrim_xbox_one_x.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0268/7523/2427/files/constructive_living_reynolds.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0497/6354/9338/files/bosch_ra_1125_7-piece_router_template_guide_set.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/3735/0814/files/jivoxuzakiz.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_off00006dd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD4 5068 bytes
SHA-256: bf1b0839e5229a2ae05507387a5be596b88d7399dbca101bf89491da0d8e4644
font_01_sfnt_off00007f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F29 11072 bytes
SHA-256: a967fdeac88db00b170cc2651dc027e9c2bf7227ec67ed8827b6f349ad149002

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