Malicious PDF — malware analysis report

Static analysis result for SHA-256 857467933f6da4ba…

MALICIOUS

PDF

44.0 KB Created: 2020-08-12 10:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2e72d880fdb94f9e4ef3c39461a72055 SHA-1: 87618c80adbf4e5172750dc2d7dccead2c0a282b SHA-256: 857467933f6da4babadbd9feb475c1688171061e428c7e56d706c05fd557d82a
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 pointing to a redirector service, suggesting a link farm or SEO poisoning attack. The primary malicious URL identified is https://ttraff.ru/pify?keyword=nielsen+total+audience+report+2020+pdf, which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to the report title and the redirector URL, indicating an attempt to lure users to malicious content. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly suggest a phishing or redirection attack.

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=nielsen+total+audience+report+2020+pdf
    • http://files.thomasfamilyadventure.com/uploads/1/3/1/0/131070733/81607f7d18870.pdf
    • http://files.oldpathsdzingre.org/uploads/1/3/1/0/131071063/zinesemojuwi.pdf
    • http://files.sthelenasportsday.com/uploads/1/3/1/4/131438353/visetu-bemixugokaxono-volojeselaku-bafawobowodiwuk.pdf
    • http://files.angrypandanetworking.com/uploads/1/3/1/6/131606003/c593287c9769.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4923/8178/files/77980340444.pdf
    • https://cdn.shopify.com/s/files/1/0437/9397/3405/files/60195229668.pdf
    • https://cdn.shopify.com/s/files/1/0427/9389/4044/files/familia_bacillaceae.pdf
    • https://cdn.shopify.com/s/files/1/0431/9569/5266/files/97374403665.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/bikilokuritedozukavufokar.pdf
    • https://cdn.shopify.com/s/files/1/0432/0244/5475/files/budgeting_in_management.pdf
    • https://cdn.shopify.com/s/files/1/0435/9821/7378/files/70584598717.pdf
    • https://cdn.shopify.com/s/files/1/0434/8909/9938/files/aashto_roadside_design_guide_2020_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/9148/3042/files/bartender_lyrics_lady_antebellum.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/39858795743.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vukabisozudetilo.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/54180338159.pdf
    • https://cdn.shopify.com/s/files/1/0431/8897/7813/files/depepixumerokonus.pdf
    • https://cdn.shopify.com/s/files/1/0434/7196/2269/files/alembic_pharma_products_list.pdf
    • https://cdn.shopify.com/s/files/1/0432/4684/6107/files/2878088661.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006d5b.bin
a153e5c51b82490241fccd1e83c0e3bdcc96c86bacb58921de655d305a10ef8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D5B 5392 bytes
font_01_sfnt_off00007fbf.bin
f2950c21072be5b5eba45b69429b03416e09b675d96a1f2c702ab28b805fae48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FBF 10192 bytes

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