Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0d394ddaa45f7a2…

MALICIOUS

PDF

38.1 KB Created: 2020-08-11 20:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cadb8afd491f7ca87dc1d3533dfc4601 SHA-1: c6527cf94895748b185652c4ca82f163152082ef SHA-256: f0d394ddaa45f7a2c5acd557a92800ce0e78b92fd10680697f78117c50e7b38b
152 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Shopify domains hosting PDF files, suggesting a link farm for SEO poisoning. One critical heuristic identified a link to a known malicious redirector infrastructure, ttraff.cc, which is used to lure users with a fake download prompt for 'alphabet tracing worksheets pdf free download'. This redirector is the primary malicious component, likely leading to further malicious content or exploits.

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=alphabet+tracing+worksheets+pdf+free+download
    • http://files.professionalpretty.com/uploads/1/3/1/8/131856353/ed466898.pdf
    • http://files.sherieunfiltered.com/uploads/1/3/2/8/132815961/a59b4b501cc8.pdf
    • http://files.thedaughterstable.com/uploads/1/3/2/6/132682790/7496442.pdf
    • http://files.bbhpsocouncil.org/uploads/1/3/1/3/131379971/tosidoninuzenopeve.pdf
    • https://cdn.shopify.com/s/files/1/0431/2770/1655/files/sifis.pdf
    • https://cdn.shopify.com/s/files/1/0430/6042/8962/files/dazukisakaluv.pdf
    • https://cdn.shopify.com/s/files/1/0431/4093/9933/files/81882724053.pdf
    • https://cdn.shopify.com/s/files/1/0429/6946/4991/files/39856353258.pdf
    • https://cdn.shopify.com/s/files/1/0440/7967/7590/files/3ds_title_keys.pdf
    • https://cdn.shopify.com/s/files/1/0431/3815/4653/files/asma_bronquial_guias_gina.pdf
    • https://cdn.shopify.com/s/files/1/0439/1760/7067/files/c_infinity_v_character_table.pdf
    • https://cdn.shopify.com/s/files/1/0433/0084/7780/files/poesias_fernando_pessoa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0381/3781/files/defomedufufadukofuxaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/2167/2356/files/97853875151.pdf
    • https://cdn.shopify.com/s/files/1/0437/8548/6485/files/algorithme_dijkstra_exercices_corrigs.pdf
    • https://cdn.shopify.com/s/files/1/0435/0076/5336/files/bipuka.pdf
    • https://cdn.shopify.com/s/files/1/0430/9336/0791/files/71065513608.pdf
    • https://cdn.shopify.com/s/files/1/0428/7728/8611/files/advances_in_space_research.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_off000055ce.bin
2e76b59605160e05fdbd346bf5f87e12dffd359d8686893a91f597f033f61849		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55CE 5700 bytes
font_01_sfnt_off0000692f.bin
1236b89f2f45c81c4dcbbccdaebea1f2ff43708c8e302dae197ae0f25e837de9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x692F 9856 bytes

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