Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd7bd748611890e…

MALICIOUS

PDF

45.2 KB Created: 2020-08-14 04:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c407f9b9daadabe14506091c960db923 SHA-1: 6b82d67c229c9a807e8fc1866bc4671bd5f8bc23 SHA-256: 6fd7bd748611890e2b7d358cea051ca02ced86880871cf406c059f7140473f41
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external PDF files, suggesting a link farm or SEO poisoning attempt. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious.

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=midsommar+parents+guide
    • http://files.mpala.net/uploads/1/3/0/7/130739510/1a1c6cf99a59bc8.pdf
    • http://files.jennycrakes.com/uploads/1/3/0/8/130874086/pozanuna.pdf
    • http://molovor.embodimentcollective.co.nz/uploads/1/3/0/7/130775164/kepelisufafokewimo.pdf
    • http://vinavegi.rootcellargardens.com/uploads/1/3/1/8/131871740/vixonunisomi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/9325/3526/files/sutareluxowoxesuwur.pdf
    • https://cdn.shopify.com/s/files/1/0429/2929/1427/files/talaximanuzadojomufazu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1989/3927/files/black_s_law_dictionary_11th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/1899/3307/files/26112643543.pdf
    • https://cdn.shopify.com/s/files/1/0428/4134/2108/files/40121615979.pdf
    • https://cdn.shopify.com/s/files/1/0440/6771/7270/files/repugupojumuwusiduvig.pdf
    • https://cdn.shopify.com/s/files/1/0434/2022/1596/files/dewalt_electrical_code_reference.pdf
    • https://cdn.shopify.com/s/files/1/0428/5336/7975/files/76513429862.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jomanumono.pdf
    • https://cdn.shopify.com/s/files/1/0429/5399/8487/files/38583756179.pdf
    • https://cdn.shopify.com/s/files/1/0427/9199/3500/files/98178347971.pdf
    • https://cdn.shopify.com/s/files/1/0428/5677/5839/files/vatulil.pdf
    • https://cdn.shopify.com/s/files/1/0430/0449/3987/files/telopopikajedufolazutefir.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_off00007271.bin
8f64e45e23ca9234b5fd50b1022891e886dcbc622d5a7e2795566de999801d52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7271 5252 bytes
font_01_sfnt_off0000843f.bin
c744d6b2090a4a89a4737cc1cfa7f3f8578903799c536daa44048aa3b738a574		 pdf-font-stream PDF embedded font (sfnt) at offset 0x843F 10652 bytes

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