Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8a086987d7d65f…

MALICIOUS

PDF

42.7 KB Created: 2020-08-06 15:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 287f1259429d8d4c92909af80966f875 SHA-1: 08a4de0eef70c0ee10df00d57cdc490fb068a3d0 SHA-256: 4c8a086987d7d65fcd457174ebe89c25fbbed74cc1a794df49384cd0c968f4de
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and contains a critical heuristic firing for a malicious redirector link. The document body and embedded artifacts suggest it is a PDF document, and the heuristics indicate it functions as a link farm, likely to redirect users to malicious content. The primary malicious IOC is the redirector URL found in the document.

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=adosphere+cahier+d+activit%25C3%25A9s+pdf
    • http://files.nativesouthwestsilver.com/uploads/1/3/1/4/131407164/6020418.pdf
    • http://files.andreakantrowitz.com/uploads/1/3/1/4/131438761/4f855430.pdf
    • http://dexofonag.m.transformationlifecoaching.net/uploads/1/3/2/6/132681394/wufazero.pdf
    • http://files.juliekgrayphotography.com/uploads/1/3/0/9/130969717/cb28d5375eaa43f.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/kavafinuvesipizini.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/ginoxidiweb.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4383/files/8572536903.pdf
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/kenmore_700_series_dryer_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/4630/4933/files/zenugakenaji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/1587610690.pdf
    • https://cdn.shopify.com/s/files/1/0430/2775/9257/files/wulaboxem.pdf
    • https://cdn.shopify.com/s/files/1/0435/4772/1882/files/jesib.pdf
    • https://cdn.shopify.com/s/files/1/0431/0512/4516/files/97338568660.pdf
    • https://cdn.shopify.com/s/files/1/0433/6130/4744/files/63668132229.pdf
    • https://cdn.shopify.com/s/files/1/0439/3716/9576/files/11309100609.pdf
    • https://cdn.shopify.com/s/files/1/0430/6780/1749/files/88569688903.pdf
    • https://cdn.shopify.com/s/files/1/0446/6117/8521/files/2016_nissan_rogue_owners_manual.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005608.bin
1c73105eba6e39e6649af15f9dcef18d3584efe97d73a89bfd861a237c9f3c4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5608 5084 bytes
font_01_sfnt_off0000672d.bin
fdce4c900067be9d7009bd011b95b36bee2b15eaa1e340021cc67cf0aadbddcd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x672D 12116 bytes
font_02_sfnt_off00008dc8.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC8 4324 bytes

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