Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe64d2eccbaa409c…

MALICIOUS

PDF

38.2 KB Created: 2020-08-07 07:40:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3376271d5c3e3f7b622a536295cea34f SHA-1: 224bc7aa398606c95fc9823350f898c0f4e33a66 SHA-256: fe64d2eccbaa409c42fa666ef5d4bdf854d89595995dffa4ed67b377c0e0a727
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to attract search engine traffic, with a primary malicious redirector URL embedded. The document body, though partially corrupted, contains text related to a manual and the malicious URL, suggesting a lure to trick users into visiting the redirector. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a dangerous link.

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/wb?keyword=olimpia%20splendid%20clima%2012%20manuale%20d
    • http://files.williamreimann.com/uploads/1/3/1/3/131384470/godoke.pdf
    • http://files.albadrivingschool.com/uploads/1/3/1/4/131406835/rivavugomajo.pdf
    • http://files.heavenlygraceministries.com/uploads/1/3/0/8/130814258/jatefovozotug.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6341/files/wawofasi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5412/1635/files/forojigilexusab.pdf
    • https://cdn.shopify.com/s/files/1/0430/3683/5993/files/the_player_formerly_known_as_mousecop.pdf
    • https://cdn.shopify.com/s/files/1/0439/2812/5595/files/cissp_cbk_4th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/14981909947.pdf
    • https://cdn.shopify.com/s/files/1/0428/6529/5526/files/salesefoxamirajaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/5915/8946/files/amar_ujala_news_paper_file_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/5231/7342/files/business_plan_for_restaurant_and_bar.pdf
    • https://cdn.shopify.com/s/files/1/0440/5726/4280/files/commencement_of_business_certificate.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/6219719719.pdf
    • https://cdn.shopify.com/s/files/1/0435/0646/6975/files/bombastic_words_and_their_synonyms.pdf
    • https://cdn.shopify.com/s/files/1/0432/6857/1299/files/1474826959.pdf
    • https://cdn.shopify.com/s/files/1/0440/1122/5246/files/positive_personality_adjectives_list.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_off00005681.bin
ff5eb252a728af5483d8ea9241bc913aa4d263ae6b303dfad82cf6bf415fe93a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5681 5368 bytes
font_01_sfnt_off000068ba.bin
a9281f65d708ff7aa4e7f84b875ee507a0f360a2255034872e73dc08338c5e07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68BA 10804 bytes

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