Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b0d4e1e0d1ac13…

MALICIOUS

PDF

48.0 KB Created: 2020-08-07 14:40:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96ec0dc69510b57ce08910fbddc10bab SHA-1: 86a1ff53b377c381c19cd7e406e17d7a016b4c60 SHA-256: 08b0d4e1e0d1ac131a3790736c8e7a730601937b2dbca67b3b90b5e40bf74304
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm for SEO manipulation. One prominent URL, https://ttraff.cc/pify?keyword=adductor+muscles+exercises+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to exercise PDFs and the authoring application, indicating a lure to disguise the malicious intent. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly suggest an attempt to drive traffic to malicious sites.

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.cc/pify?keyword=adductor+muscles+exercises+pdf
    • http://files.downtowndairyqueen.com/uploads/1/3/2/6/132681479/dijugabelar.pdf
    • http://files.norchestergardenclub.com/uploads/1/3/1/8/131871984/064a2f82.pdf
    • http://files.mrkohler.com/uploads/1/3/2/6/132696621/mudegakojilajaw_kipudageb_mavokale_wapumimo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/0025/1036/files/ketones.pdf
    • https://cdn.shopify.com/s/files/1/0435/2878/1973/files/zuzoliwunebuboguzikefopem.pdf
    • https://cdn.shopify.com/s/files/1/0428/1604/5222/files/84020754419.pdf
    • https://cdn.shopify.com/s/files/1/0428/4959/9651/files/zupibarepegesu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3998/0711/files/wagurijuwepelapewemavupi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7916/2263/files/22546701737.pdf
    • https://cdn.shopify.com/s/files/1/0431/1246/4535/files/bsava_manuals_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/0085/5706/files/pefiduroxizopibun.pdf
    • https://cdn.shopify.com/s/files/1/0437/0441/8459/files/scratch_2._0_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/1184/0927/files/vajolimaputavimuzaxasugiv.pdf
    • https://cdn.shopify.com/s/files/1/0447/5482/9463/files/flight_of_the_bumblebee_partitura_piano.pdf
    • https://cdn.shopify.com/s/files/1/0431/5833/9733/files/xebibir.pdf
    • https://cdn.shopify.com/s/files/1/0439/4608/2472/files/regcure_pro_key.pdf
    • https://cdn.shopify.com/s/files/1/0438/2123/6381/files/58753041913.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000712b.bin
76450fb062f882cd32fc3b3d347f3d908e38c891b3ccc5b07ad60e9aaf4f9eff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x712B 4924 bytes
font_01_sfnt_off000081f2.bin
0c6fe86e13ef65951b08c2466e7043e6ade543a7bf6415331d7468b1d3f423c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81F2 10132 bytes
font_02_sfnt_off0000a49a.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA49A 4324 bytes

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