Malicious PDF — malware analysis report

Static analysis result for SHA-256 efff6bac9c732116…

MALICIOUS

PDF

46.6 KB Created: 2020-07-29 04:29:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4f98a17019b296669b7414180d8caea SHA-1: 9b084743e234e630bcfe8f3a24ede86ff3ffc2db SHA-256: efff6bac9c7321167c1b8381695468216d25eaf7420a5c3f2b30c10c33540699
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. Another critical heuristic identified a large external PDF link farm, with the dominant host being cdn.shopify.com. The ML classifier also flagged the PDF as malicious with high confidence. The document body, though heavily obfuscated, appears to contain keywords related to paid Android apps, suggesting a lure for users interested in such content.

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/pify?keyword=best+paid+android+apps+for+photography
    • http://files.revolutionsigning.com/uploads/1/3/1/3/131380107/jikege_vazeneroxisode_dunonosomi_nefutisap.pdf
    • http://files.pinheadsquilting.ca/uploads/1/3/1/3/131398333/weteg.pdf
    • http://files.mullismade.com/uploads/1/3/0/7/130776599/7939630.pdf
    • http://files.relationshipmartech.com/uploads/1/3/0/8/130874257/6427009.pdf
    • http://files.amysclassiccandy.com/uploads/1/3/1/3/131383586/lopedovexinuwusid.pdf
    • http://files.mullismade.com/uploads
    • https://cdn.shopify.com/s/files/1/0431/2324/5207/files/piligibituwipadivodike.pdf
    • https://cdn.shopify.com/s/files/1/0428/0044/7655/files/63738971546.pdf
    • https://cdn.shopify.com/s/files/1/0432/6948/8798/files/53850018179.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/muzoguganava.pdf
    • https://cdn.shopify.com/s/files/1/0429/3325/6345/files/ralakatika.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8580/files/42969863154.pdf
    • https://cdn.shopify.com/s/files/1/0430/6763/7917/files/12585410792.pdf
    • https://cdn.shopify.com/s/files/1/0428/9904/6553/files/14482928296.pdf
    • https://cdn.shopify.com/s/files/1/0429/6504/1308/files/wejukurakefunoxuz.pdf
    • https://cdn.shopify.com/s/files/1/0438/5928/0022/files/pajobemubobumizarunub.pdf
    • https://cdn.shopify.com/s/files/1/0437/3096/0549/files/72292997207.pdf
    • https://cdn.shopify.com/s/files/1/0427/4028/5607/files/ginisifajexokitob.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3367/files/72831921354.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_off000076a0.bin
58574bf4191885824ec54c100f7eed16d402be78eb7f7cc96ccb2ea40de744fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76A0 5208 bytes
font_01_sfnt_off00008854.bin
fc495356af5b9367e92595a4c03a83bb9e51ce2150e787f25b60c72b5f247a60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8854 10668 bytes

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