Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3e2d3a08886536…

MALICIOUS

PDF

45.2 KB Created: 2020-07-30 21:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 23b57f043a0413a2a1225aa80e871fe4 SHA-1: 41f2c5638b1ab692213f014836adf95b6e8e3f30 SHA-256: 9e3e2d3a08886536270fe3b1e5d8a89071af5aff1f0625c342647560fd0d9645
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.com/pify?keyword=biodiversity+and+conservation+class+12+notes+pdf'. This indicates a phishing or scam attempt, likely using the document content as a lure. The PDF also hosts a link farm to numerous other PDFs, suggesting an attempt to game search engine results or distribute content widely. The ML classifier 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.com/pify?keyword=biodiversity+and+conservation+class+12+notes+pdf
    • http://files.menorthwest.org/uploads/1/3/0/7/130775714/dixoniz.pdf
    • http://files.holidayapartments-berlin.com/uploads/1/3/0/7/130775985/roxuk.pdf
    • http://files.terencejiam.com/uploads/1/3/0/9/130969693/3496159.pdf
    • http://files.terencejiam.com
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/52929841292.pdf
    • https://cdn.shopify.com/s/files/1/0435/3500/7893/files/bekilewufawuxixo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3400/8987/files/refuvawekavulakubosemimu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9377/8837/files/63226740063.pdf
    • https://cdn.shopify.com/s/files/1/0434/3840/7845/files/70054013220.pdf
    • https://cdn.shopify.com/s/files/1/0432/7096/3350/files/zuwonukixuwetituz.pdf
    • https://cdn.shopify.com/s/files/1/0440/1030/7749/files/savapopisabuzibujatima.pdf
    • https://cdn.shopify.com/s/files/1/0430/3867/1010/files/wuzojuvop.pdf
    • https://cdn.shopify.com/s/files/1/0432/2931/5239/files/wevesuzorulerefuxofam.pdf
    • https://cdn.shopify.com/s/files/1/0429/5095/1066/files/79139064486.pdf
    • https://cdn.shopify.com/s/files/1/0435/8746/9471/files/xagebogis.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/kaduduwopovud.pdf
    • https://cdn.shopify.com/s/files/1/0429/8991/2218/files/pesoxaduse.pdf
    • https://cdn.shopify.com/s/files/1/0433/6871/0309/files/43813820704.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_off0000725e.bin
63536986c51f54d78737b807b6c1520fe22e003e1dbce64da396d828e7be522d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x725E 5332 bytes
font_01_sfnt_off000084a2.bin
63022b2a27d5afbd1f2a13d4c2da3741ac27cdbe8c1a6bd2b0d9b5ee47544aed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84A2 10076 bytes

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